What and why?

This PR adds a GitHub Actions workflow to automatically manage stale issues that are waiting for responses. The goal is to keep the issue tracker clean by automatically closing issues with the awaiting-response label that have been inactive for 17 days (14 days to mark as stale with a message + 3 days to close). This helps maintain repository hygiene and ensures issues don't remain open indefinitely when waiting for user responses.

How?

• Added .github/workflows/stale.yml using the Stale Github Action
• Targets only issues with the awaiting-response label
• Adds stale label when marking issues as stale and automatically-closed label when closing
• Automatically removes stale label when issues are updated

Debugging

As a first step, the workflow:

• can only be triggered manually
• includes debug-only: true in the configuration for initial testing; this flag allows to safely observe what the workflow would do, without affecting any issues

A follow-up PR will:

• set debug-only to false
• schedule the action to run daily

Review checklist

• Feature or bugfix MUST have appropriate tests (unit, integration)
• Make sure each commit and the PR mention the Issue number or JIRA reference
• Add CHANGELOG entry for user facing changes
• Add Objective-C interface for public APIs (see our guidelines (internal) and run make api-surface)