Move internal Actions into .github/actions

This is a more standard location for these custom Actions.

.github/check-codescanning-config/action.yml

@@ -1,62 +0,0 @@
-name: Check Code-Scanning Config
-description: |
-    Checks the code scanning configuration file generated by the
-    action to ensure it contains the expected contents
-inputs:
-  languages:
-    required: false
-    description: The languages field passed to the init action.
-
-  packs:
-    required: false
-    description: The packs field passed to the init action.
-
-  queries:
-    required: false
-    description: The queries field passed to the init action.
-
-  config-file-test:
-    required: false
-    description: |
-      The location of the config file to use. If empty,
-      then no config file is used.
-
-  expected-config-file-contents:
-    required: true
-    description: |
-      A JSON string containing the exact contents of the config file.
-
-  tools:
-    required: true
-    description: |
-      The url of codeql to use.
-
-runs:
-  using: composite
-  steps:
-    - uses: ./../action/init
-      with:
-        languages: ${{ inputs.languages }}
-        config-file: ${{ inputs.config-file-test }}
-        queries: ${{ inputs.queries }}
-        packs: ${{ inputs.packs }}
-        tools: ${{ inputs.tools }}
-        db-location: ${{ runner.temp }}/codescanning-config-cli-test
-      env:
-        CODEQL_ACTION_TEST_MODE: 'true'
-
-    - name: Install dependencies
-      shell: bash
-      run: npm install --location=global ts-node js-yaml
-
-    - name: Check config
-      working-directory: ${{ github.action_path }}
-      shell: bash
-      run: ts-node ./index.ts "${{ runner.temp }}/user-config.yaml" '${{ inputs.expected-config-file-contents }}'
-
-    - name: Clean up
-      shell: bash
-      if: always()
-      run: |
-        rm -rf ${{ runner.temp }}/codescanning-config-cli-test
-        rm -rf ${{ runner.temp }}/user-config.yaml