Adjust collab CI to run on weekly schedule instead of every PR

[Copilot]

This PR modifies the Google Colab execution workflow (collab.yml) to run on a weekly schedule instead of on every pull request, and adds automated issue creation when execution failures occur.

Changes Made

Trigger Schedule: Changed from on: [pull_request] to weekly execution on Mondays at 4am UTC using cron schedule '0 4 * * 1'. This prevents the expensive Colab execution checks from running on every PR while still maintaining regular validation.

Issue Creation on Failure: Added automated issue creation when execution fails using the peter-evans/create-issue-from-file@v5 action. The created issues include:

• Direct link to the failed workflow run
• Detailed execution reports as artifacts
• Step-by-step guidance for investigating and resolving failures
• Appropriate labels for tracking (execution-failure, automated-issue, colab)

Permissions: Added issues: write permission to enable automated issue creation.

Manual Trigger: Included workflow_dispatch to allow manual execution when needed for testing or investigation.

Checkout Simplification: Removed the pull request specific checkout reference since the workflow no longer handles PR events.

Benefits

• Reduced CI Load: Eliminates expensive Colab execution checks from running on every PR
• Proactive Monitoring: Weekly automated validation ensures execution issues are caught regularly
• Better Issue Tracking: Automatic issue creation with detailed context makes it easier to track and resolve execution problems
• Operational Efficiency: Maintains execution validation without impacting developer workflow

The workflow now runs weekly at 4am UTC (offset from the cache build at 3am) and will create detailed issues when notebook execution fails in the Colab environment.

Fixes #600.

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