feat: Eslint rules (#9839)

# Pull Request Template

## Description

This PR adds new eslint rules to the code base.

**Error rules**

|    Rule name     | Type | Files updated |
| ----------------- | --- | - |
| `vue/block-order`  | error  |  ✅  |
| `vue/component-name-in-template-casing`  | error  |  ✅  |
| `vue/component-options-name-casing`  | error  |  ✅  |
| `vue/custom-event-name-casing`  | error  |  ✅  |
| `vue/define-emits-declaration`  | error  |  ✅  |
| `vue/no-unused-properties`  | error  |  ✅  |
| `vue/define-macros-order`  | error  |  ✅  |
| `vue/define-props-declaration`  | error  |  ✅  |
| `vue/match-component-import-name`  | error  |  ✅  |
| `vue/next-tick-style`  | error  |  ✅  |
| `vue/no-bare-strings-in-template`  | error  |  ✅  |
| `vue/no-empty-component-block`  | error  |  ✅  |
| `vue/no-multiple-objects-in-class`  | error  |  ✅  |
| `vue/no-required-prop-with-default`  | error  |  ✅  |
| `vue/no-static-inline-styles`  | error  |  ✅  |
| `vue/no-template-target-blank`  | error  |  ✅  |
| `vue/no-this-in-before-route-enter`  | error  |  ✅  |
| `vue/no-undef-components`  | error  |  ✅  |
| `vue/no-unused-emit-declarations`  | error  |  ✅  |
| `vue/no-unused-refs`  | error  |  ✅  |
| `vue/no-use-v-else-with-v-for`  | error  |  ✅  |
| `vue/no-useless-v-bind`  | error  |  ✅  |
| `vue/no-v-text`  | error  |  ✅  |
| `vue/padding-line-between-blocks`  | error  |  ✅  |
| ~`vue/prefer-prop-type-boolean-first`~ | ~error~ | ❌ (removed this
rule, cause a bug in displaying custom attributes) |
| `vue/prefer-separate-static-class`  | error  |  ✅  |
| `vue/prefer-true-attribute-shorthand`  | error  |  ✅  |
| `vue/require-explicit-slots`  | error  |  ✅  |
| `vue/require-macro-variable-name`  | error  |  ✅  |


**Warn rules**

|    Rule name     | Type | Files updated |
| ---- | ------------- | ------------- |
| `vue/no-root-v-if`  | warn  |  ❎  |


Fixes https://linear.app/chatwoot/issue/CW-3492/vue-eslint-rules

## Type of change

- [x] New feature (non-breaking change which adds functionality)


## Checklist:

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [x] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [x] I have added tests that prove my fix is effective or that my
feature works
- [x] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules

---------

Co-authored-by: Fayaz Ahmed <fayazara@gmail.com>
Co-authored-by: Muhsin Keloth <muhsinkeramam@gmail.com>
Co-authored-by: Shivam Mishra <scm.mymail@gmail.com>
Co-authored-by: Pranav <pranav@chatwoot.com>

app/javascript/widget/components/ChatHeader.vue

@@ -1,52 +1,4 @@
-<template>
-  <header
-    class="flex justify-between p-5 w-full"
-    :class="$dm('bg-white', 'dark:bg-slate-900')"
-  >
-    <div class="flex items-center">
-      <button
-        v-if="showBackButton"
-        class="-ml-3 px-2"
-        @click="onBackButtonClick"
-      >
-        <fluent-icon
-          icon="chevron-left"
-          size="24"
-          :class="$dm('text-black-900', 'dark:text-slate-50')"
-        />
-      </button>
-      <img
-        v-if="avatarUrl"
-        class="h-8 w-8 rounded-full mr-3"
-        :src="avatarUrl"
-        alt="avatar"
-      />
-      <div>
-        <div
-          class="font-medium text-base leading-4 flex items-center"
-          :class="$dm('text-black-900', 'dark:text-slate-50')"
-        >
-          <span v-dompurify-html="title" class="mr-1" />
-          <div
-            :class="`h-2 w-2 rounded-full
-              ${isOnline ? 'bg-green-500' : 'hidden'}`"
-          />
-        </div>
-        <div
-          class="text-xs mt-1 leading-3"
-          :class="$dm('text-black-700', 'dark:text-slate-400')"
-        >
-          {{ replyWaitMessage }}
-        </div>
-      </div>
-    </div>
-    <header-actions :show-popout-button="showPopoutButton" />
-  </header>
-</template>
-
 <script>
-import { mapGetters } from 'vuex';
-
 import availabilityMixin from 'widget/mixins/availability';
 import nextAvailabilityTime from 'widget/mixins/nextAvailabilityTime';
 import FluentIcon from 'shared/components/FluentIcon/Index.vue';
@@ -84,9 +36,6 @@ export default {
     },
   },
   computed: {
-    ...mapGetters({
-      widgetColor: 'appConfig/getWidgetColor',
-    }),
     isOnline() {
       const { workingHoursEnabled } = this.channelConfig;
       const anyAgentOnline = this.availableAgents.length > 0;
@@ -104,3 +53,49 @@ export default {
   },
 };
 </script>
+
+<template>
+  <header
+    class="flex justify-between w-full p-5"
+    :class="$dm('bg-white', 'dark:bg-slate-900')"
+  >
+    <div class="flex items-center">
+      <button
+        v-if="showBackButton"
+        class="px-2 -ml-3"
+        @click="onBackButtonClick"
+      >
+        <FluentIcon
+          icon="chevron-left"
+          size="24"
+          :class="$dm('text-black-900', 'dark:text-slate-50')"
+        />
+      </button>
+      <img
+        v-if="avatarUrl"
+        class="w-8 h-8 mr-3 rounded-full"
+        :src="avatarUrl"
+        alt="avatar"
+      />
+      <div>
+        <div
+          class="flex items-center text-base font-medium leading-4"
+          :class="$dm('text-black-900', 'dark:text-slate-50')"
+        >
+          <span v-dompurify-html="title" class="mr-1" />
+          <div
+            :class="`h-2 w-2 rounded-full
+              ${isOnline ? 'bg-green-500' : 'hidden'}`"
+          />
+        </div>
+        <div
+          class="mt-1 text-xs leading-3"
+          :class="$dm('text-black-700', 'dark:text-slate-400')"
+        >
+          {{ replyWaitMessage }}
+        </div>
+      </div>
+    </div>
+    <HeaderActions :show-popout-button="showPopoutButton" />
+  </header>
+</template>