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/ChatHeaderExpanded.vue

@@ -1,35 +1,3 @@
-<template>
-  <header
-    class="header-expanded pt-6 pb-4 px-5 relative box-border w-full bg-transparent"
-  >
-    <div
-      class="flex items-start"
-      :class="[avatarUrl ? 'justify-between' : 'justify-end']"
-    >
-      <img
-        v-if="avatarUrl"
-        class="h-12 rounded-full"
-        :src="avatarUrl"
-        alt="Avatar"
-      />
-      <header-actions
-        :show-popout-button="showPopoutButton"
-        :show-end-conversation-button="false"
-      />
-    </div>
-    <h2
-      v-dompurify-html="introHeading"
-      class="mt-4 text-2xl mb-1.5 font-medium"
-      :class="$dm('text-slate-900', 'dark:text-slate-50')"
-    />
-    <p
-      v-dompurify-html="introBody"
-      class="text-base leading-normal"
-      :class="$dm('text-slate-700', 'dark:text-slate-200')"
-    />
-  </header>
-</template>
-
 <script>
 import HeaderActions from './HeaderActions.vue';
 import darkModeMixin from 'widget/mixins/darkModeMixin.js';
@@ -60,3 +28,35 @@ export default {
   },
 };
 </script>
+
+<template>
+  <header
+    class="header-expanded pt-6 pb-4 px-5 relative box-border w-full bg-transparent"
+  >
+    <div
+      class="flex items-start"
+      :class="[avatarUrl ? 'justify-between' : 'justify-end']"
+    >
+      <img
+        v-if="avatarUrl"
+        class="h-12 rounded-full"
+        :src="avatarUrl"
+        alt="Avatar"
+      />
+      <HeaderActions
+        :show-popout-button="showPopoutButton"
+        :show-end-conversation-button="false"
+      />
+    </div>
+    <h2
+      v-dompurify-html="introHeading"
+      class="mt-4 text-2xl mb-1.5 font-medium"
+      :class="$dm('text-slate-900', 'dark:text-slate-50')"
+    />
+    <p
+      v-dompurify-html="introBody"
+      class="text-base leading-normal"
+      :class="$dm('text-slate-700', 'dark:text-slate-200')"
+    />
+  </header>
+</template>