Remove Suicide trigger check from Cylc lint

[wxtim]

Check List

• I have read CONTRIBUTING.md and added my name as a Code Contributor.
• Contains logically grouped changes (else tidy your branch by rebase).
• Does not contain off-topic changes (use other PRs for other changes).
• Applied any dependency changes to both setup.cfg (and conda-environment.yml if present).
• Tests are included (or explain why tests are not needed).
• Changelog entry included if this is a change that can affect users
• Cylc-Doc pull request opened if required at cylc/cylc-doc/pull/XXXX.
• If this is a bug fix, PR should be raised against the relevant ?.?.x branch.

[oliver-sanders]

Unfortunately, just removing the rule, causes cylc lint to error in all cases if a user has worked around this by adding U008 to the ignore list in pyproject.toml. Might need some extra logic to prevent this.

[wxtim]

if a user has worked around this by adding U008 to

🐆