Kotlin: Remove kotlin branch CI test

.github/workflows/test-kotlin.yml

@@ -1,72 +0,0 @@
-# This is a basic workflow to help you get started with Actions
-
-name: Kotlin Tests
-
-# Controls when the workflow will run
-on:
-  # Triggers the workflow on push or pull request events but only for the kotlin branch
-  push:
-    branches: [ kotlin ]
-  pull_request:
-    branches: [ kotlin ]
-
-  # Allows you to run this workflow manually from the Actions tab
-  workflow_dispatch:
-
-# A workflow run is made up of one or more jobs that can run sequentially or in parallel
-jobs:
-  # This workflow contains a single job called "build"
-  build:
-    # The type of runner that the job will run on
-    runs-on: ubuntu-latest
-
-    # Steps represent a sequence of tasks that will be executed as part of the job
-    steps:
-      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - name: Checkout semmle-code
-        uses: actions/checkout@v2
-        with:
-          ref: kotlin
-          submodules: recursive
-          fetch-depth: 1
-          lfs: true
-          repository: github/semmle-code
-          token: ${{ secrets.CI_TOKEN }}
-
-      - name: Checkout codeql-kotlin
-        shell: bash
-        working-directory: ql
-        env:
-          QL_SUBMODULE_SHA: '${{ github.ref }}'
-        run: |
-          git remote set-url origin git@github.com:github/codeql-kotlin.git
-          git fetch --depth=1 origin "$QL_SUBMODULE_SHA"
-          git checkout FETCH_HEAD
-          # needed so that `git describe --all` works during the build
-          git tag "custom-qlSubmoduleSha-${QL_SUBMODULE_SHA}"
-
-      - name: Setup dotnet
-        uses: actions/setup-dotnet@v1
-        with:
-          dotnet-version: |
-            5.0.303
-            5.0.404
-            6.0.101
-
-      - name: Prepare - Linux
-        uses: ./.github/actions/prepare-linux
-
-      - name: Build - Unit tests
-        shell: bash
-        run: |
-          ./build -j2 target/test/java/results.xml TESTSUITE_FLAGS+=ql/java/ql/test/kotlin 'TESTSUITE_FLAGS+=#'
-
-      - name: Build - Integration tests - Posix
-        shell: bash
-        run: |
-          ./build -j2 target/test/codeql-integration-tests/results.xml 'LANG_TESTSUITE_FLAGS+=--test-dir integration-tests/posix-only/kotlin'
-
-      - name: Build - Integration tests - Linux
-        shell: bash
-        run: |
-          ./build -j2 target/test/codeql-integration-tests/results.xml 'LANG_TESTSUITE_FLAGS+=--test-dir integration-tests/linux-only/kotlin'