Rename TEST_MODE to specific variable for CodeQL Action

This allows us to set it automatically in the workflow generator,
simplifying things and reducing the scope for error.

.github/workflows/__upload-ref-sha-input.yml

@@ -83,8 +83,6 @@ jobs:
         languages: cpp,csharp,java,javascript,python
         config-file: ${{ github.repository }}/tests/multi-language-repo/.github/codeql/custom-queries.yml@${{
           github.sha }}
-      env:
-        TEST_MODE: true
     - name: Build code
       shell: bash
       run: ./build.sh
@@ -93,13 +91,10 @@ jobs:
         ref: refs/heads/main
         sha: 5e235361806c361d4d3f8859e3c897658025a9a2
         upload: false
-      env:
-        TEST_MODE: true
     - uses: ./../action/upload-sarif
       with:
         ref: refs/heads/main
         sha: 5e235361806c361d4d3f8859e3c897658025a9a2
-      env:
-        TEST_MODE: true
     env:
       INTERNAL_CODEQL_ACTION_DEBUG_LOC: true
+      CODEQL_ACTION_TEST_MODE: true