fix: react android kotlin plugin version conflict (#34255)

Summary:
Fixes #34229

Basically, the react android conflicts with the kotlin version that's defined in the top level build.gradle. To resolve it, the approach was to get the `kotlinVersion` defined in top level build.gradle and use it. If it's not defined, we use the default(1.6.10 as of now).

The reason behind not using the DSL is that it doesn't allow us to use the variables due to it's constrained syntax.
See [here](https://docs.gradle.org/current/userguide/plugins.html#sec:constrained_syntax)

So the idea was to use the build script to resolve the kotlin plugin and it works 👍 .

Kindly asking for review cortinico :)

## Changelog

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[Android] [Changed] - refactored usage of kotlin plugin

Pull Request resolved: #34255

Test Plan: Ran the node ./scripts/run-ci-e2e-tests.js --js --android --ios to verify it doesn't introduce any unexpected issues.

Reviewed By: dmitryrykun

Differential Revision: D38468567

Pulled By: cortinico

fbshipit-source-id: f9ab635fcf033f1d337ed90793ba1667957b8e01

ReactAndroid/build.gradle

@@ -5,10 +5,15 @@
  * LICENSE file in the root directory of this source tree.
  */
 
+buildscript {
+    dependencies {
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:${rootProject.hasProperty("kotlinVersion") ? rootProject.ext.kotlinVersion : KOTLIN_VERSION}"
+    }
+}
+
 plugins {
     id("com.android.library")
     id("com.facebook.react")
-    id("org.jetbrains.kotlin.android") version "1.6.10"
     id("maven-publish")
     id("de.undercouch.download")
 }
@@ -484,3 +489,5 @@ afterEvaluate {
         }
     }
 }
+
+apply plugin: "org.jetbrains.kotlin.android"

ReactAndroid/gradle.properties

@@ -34,5 +34,8 @@ FOLLY_VERSION=2021.07.22.00
 GLOG_VERSION=0.3.5
 LIBEVENT_VERSION=2.1.12
 
+# Plugins Versions
+KOTLIN_VERSION=1.6.10
+
 android.useAndroidX=true
 android.enableJetifier=true