workflows: add debug input for sync templates act

[iulianbarbu]

Description

Introduce a workflow debug input for misc-sync-templates.yml and use it instead of the runner.debug context variable, which is set to '1' when ACTIONS_RUNNER_DEBUG env/secret is set (https://docs.github.com/en/actions/monitoring-and-troubleshooting-workflows/troubleshooting-workflows/enabling-debug-logging#enabling-runner-diagnostic-logging). This is useful for controlling when to show debug prints.

Integration

N/A

Review Notes

Using runner.debug requires setting the ACTIONS_RUNNER_DEBUG env variable, but setting it to false/true is doable through an input, or by importing a variable from the github env file (which requires a code change). This input alone can replace the entire runner.debug + ACTIONS_RUNNER_DEBUG setup, which simplifies debug printing, but it doesn't look as standard as runner.debug. I don't think it is a big deal overall, for this action alone, but happy to account for other opinions.

Note: setting the ACTIONS_RUNNER_DEBUG whenever we want in a separate branch wouldn't be useful because we can not run the misc-sync-templates.yml action from other branch than master (due to branch protection rules), so we need to expose this input to be controllable from master.