chore(android): Remove i686 android target (#3547)

This increases our app bundle size with no real benefit. ~~I'm also
encountering an issue where the `x86` shared library is being loaded
instead of the appropriate x86_64 one, causing a crash.~~ Edit: The
crash appears to be coming from somewhere else, still investigating.
Still it would be good to remove this as the Rust dependency in the
Android build is built serially.

.github/workflows/_kotlin.yml

@@ -41,7 +41,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: ./.github/actions/setup-rust
         with:
-          targets: armv7-linux-androideabi aarch64-linux-android x86_64-linux-android i686-linux-android
+          targets: armv7-linux-androideabi aarch64-linux-android x86_64-linux-android
       - uses: actions/setup-java@v4
         with:
           distribution: temurin

.github/workflows/e2e.yml

@@ -170,7 +170,7 @@ jobs:
       - uses: ./.github/actions/setup-rust
         with:
           sccache_enabled: false
-          targets: armv7-linux-androideabi aarch64-linux-android x86_64-linux-android i686-linux-android
+          targets: armv7-linux-androideabi aarch64-linux-android x86_64-linux-android
       - uses: actions/setup-java@v4
         with:
           distribution: oracle

kotlin/android/README.md

@@ -49,7 +49,6 @@ locally.
    aarch64-linux-android
    arm-linux-androideabi
    armv7-linux-androideabi
-   i686-linux-android
    x86_64-linux-android
    ```
 
@@ -58,7 +57,7 @@ locally.
    `/rust/rust-toolchain.toml` file), then run:
 
    ```
-   rustup target add aarch64-linux-android arm-linux-androideabi armv7-linux-androideabi i686-linux-android x86_64-linux-android
+   rustup target add aarch64-linux-android arm-linux-androideabi armv7-linux-androideabi x86_64-linux-android
    ```
 
 1. Perform a test build: `./gradlew assembleDebug`.

kotlin/android/app/build.gradle.kts

@@ -217,7 +217,7 @@ cargo {
     verbose = true
     module = "../../../rust/connlib/clients/android"
     libname = "connlib"
-    targets = listOf("arm", "arm64", "x86_64", "x86")
+    targets = listOf("arm", "arm64", "x86_64")
     targetDirectory = "../../../rust/target"
 }