chore: convert the header-checker-lint.yml to yaml (#5855)
chore: convert the header-checker-lint.yml to yaml (#5855)

I just converted the config to yaml format.

FYI:
Now the header-checker-lint bot creates failing status check for invalid config files.
Also, the bot now reads the config file from the PR head.
GoogleCloudPlatform/python-docs-samples,GoogleCloudPlatform/python-docs-samples,GoogleCloudPlatform/python-docs-samples,GoogleCloudPlatform/python-docs-samples