chore: Remove pull_request trigger from auto-project workflows

[MantisClone]

Problem

The add-to-project reusable workflow was simplified to only auto-add issues to the project board (PRs are no longer auto-added). However, the caller workflows in individual repos still trigger on pull_request events, causing unnecessary workflow runs that immediately skip.

See RequestNetwork/.github commits fad6edd and 4ca761b for the reusable workflow changes.

Proposed Solution

Update all caller workflows (.github/workflows/auto-project.yml) across repos to remove the pull_request trigger:

Before:

on:
  issues:
    types: [opened]
  pull_request:
    types: [opened]

After:

on:
  issues:
    types: [opened]

Affected Repos

54 repos need updating. PRs will be linked below as they're created.

Considerations

• Low priority - current setup works, just wasteful
• Simple mechanical change across all repos

[coderabbitai]

🔗 Related PRs

#128 - chore: add auto-project workflow [merged]

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