OSOE-188: YAML Linting

[tteguayco]

OSOE-188
Enabling linting of YAML files from:

• GitHub Actions
• Local development (includes instructions)

Fixes Lombiq/NodeJs-Extensions#11.

Summary by CodeRabbit

• New Features

  • Introduced a new GitHub Action for YAML linting.
  • Added a new workflow for linting YAML files.
  • Created a spelling check action with a custom allow list.

• Bug Fixes

  • Improved error handling in GitHub Action scripts.

• Documentation

  • Updated documentation to include new YAML linting workflow.
  • Added guidelines for YAML linting in productivity workflows.

• Refactor

  • Updated custom GitHub actions to reference a specific branch for consistency.

• Chores

  • Cleaned up whitespace and minor description alterations in action configurations.
  • Updated .gitignore to include new exclusions.

[tteguayco]

The configuration file is very basic right now. I assume we'll want to discuss what kind of rules we want to apply to our YAML files.

[DemeSzabolcs]

@Piedone, @BenedekFarkas could you please help me with merging this?

The problem is that there is a bug in Get-GHA-Items-From-File-List.ps1 (in this PR now renamed to Get-GhaItemsFromFileList.ps1), this PR includes the fix, but the bug is on dev so when I try to switch the actions to dev it will fail because of the bug, so I can't merge it.

And because of the protection rules, I can't push it to dev.