Remove precommit and wrapper validation workflows for gradle as we migrate it to internal CI tools (#452)

Remove CI.yml for gradle precommits as we migrate it to internal CI tools

Signed-off-by: Peter Zhu <zhujiaxi@amazon.com>

.github/workflows/CI.yml

@@ -1,22 +0,0 @@
-name: Search CI
-on:
-  push:
-    branches:
-      - main
-  pull_request:
-    branches:
-      - main
-
-jobs:
-  precommit_check:
-    name: Precommit Checks
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout Search
-        uses: actions/checkout@v2
-      - name: Setup Java 14
-        uses: actions/setup-java@v1
-        with:
-          java-version: 14
-      - name: Run Precommit Checks
-        run: ./gradlew precommit --parallel

.github/workflows/gradle-wrapper-validation.yml

@@ -1,16 +0,0 @@
-name: "Validate Gradle Wrapper"
-on:
-  push:
-    branches:
-      - main
-  pull_request:
-    branches:
-      - main
-
-jobs:
-  validation:
-    name: "Validation"
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - uses: gradle/wrapper-validation-action@v1