Revert "Build list of required jobs in generate-workflow (#4326)" (#4413)

This reverts commit 22879d6.

Now that we have just one job to check we don't need to build the list anymore.

Author: xrmx

.github/workflows/generate_required_checks.py

@@ -61,6 +61,3 @@ target
 
 # Benchmark result files
 *-benchmark.json
-
-# opentelemetry-admin jobs
-opentelemetry-admin-jobs.txt

.gitignore

@@ -1124,7 +1124,6 @@ deps =
 
 commands =
   python {toxinidir}/.github/workflows/generate_workflows.py
-  python {toxinidir}/.github/workflows/generate_required_checks.py
 
 [testenv:shellcheck]