docs(action): explicitly mark all optional inputs with required: false

[kranthipoturaju]

Summary

Explicitly adds required: false to all optional inputs in action.yml that were missing the declaration. No behavior is changed.

Changes

• Added required: false to: dotnet-version, dotnet-quality, dotnet-channel, global-json-file, source-url, owner, config-file
• cache, cache-dependency-path, workloads, and architecture already had required: false and were not modified

Motivation

GitHub Actions treats omitted required as false implicitly, but leaving it unset creates ambiguity for:

• Consumers reading action.yml to understand the action's contract
• Tooling (IDEs, linters, schema validators) that introspects action metadata
• Contributors assessing whether an input must be provided

Impact

• Users: No behavioral change — all affected inputs were already optional in practice
• Backward compatibility: Fully preserved; this is a metadata-only change

Testing

No code paths are affected. The action.yml schema change can be validated by running the existing test suite to confirm no regressions.

Related issue:
Change is only associated with documentation and no code changes are made.

Check list:

• Mark if documentation changes are required.
• Mark if tests were added or updated to cover the changes.

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

This PR updates the GitHub Action metadata to explicitly mark several inputs as non-required, improving clarity/consistency for consumers of the action.

Changes:

• Add required: false to multiple optional inputs in action.yml.

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