[MNT] Prevents assignment on Restricted Labels

[kavya-r30]

Reference Issues/PRs

Contributes #2697

What does this implement/fix? Explain your changes.

Prevents assignment of issues where certain restricted labels are present when calling aeon-actions-bot restricted_labels = {"meta-issue"}

This solves the first part of the issue #2697

Does your contribution introduce a new dependency? If yes, which one?

Any other comments?

PR checklist

For all contributions

• [ ] I've added myself to the list of contributors. Alternatively, you can use the @all-contributors bot to do this for you after the PR has been merged.
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For new estimators and functions

• [ ] I've added the estimator/function to the online API documentation.
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For developers with write access

• [ ] (OPTIONAL) I've updated aeon's CODEOWNERS to receive notifications about future changes to these files.

[aeon-actions-bot[bot]]

Thank you for contributing to aeon

I have added the following labels to this PR based on the title: [ $\color{#EC843A}{\textsf{maintenance}}$ ].

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PR CI actions

These checkboxes will add labels to enable/disable CI functionality for this PR. This may not take effect immediately, and a new commit may be required to run the new configuration.

• [ ] Run pre-commit checks for all files
• [ ] Run mypy typecheck tests
• [ ] Run all pytest tests and configurations
• [ ] Run all notebook example tests
• [ ] Run numba-disabled codecov tests
• [ ] Stop automatic pre-commit fixes (always disabled for drafts)
• [ ] Disable numba cache loading
• [ ] Push an empty commit to re-run CI checks

[MatthewMiddlehurst]

Please ensure that this works on your fork first.

[MatthewMiddlehurst]

See #2703

[kavya-r30]

@MatthewMiddlehurst I created a mirror and build the workflow and app to test out the issue_assign actions since it dint let me do on my fork due to github token:

1. Test for meta-issue label: https://github.com/kavya-r30/aeon-test/issues/3
2. Test without meta-issue: https://github.com/kavya-r30/aeon-test/issues/4
3. Test for multiple issue: https://github.com/kavya-r30/aeon-test/issues/5

[MatthewMiddlehurst]

Please remove the branches or workflow pinging for stale branches https://github.com/kavya-r30/aeon-test/issues