Lint.job runner specific timeout

[wxtim]

Closes #6131

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[MetRonnie]

Marked my review comment as resolved but then it's hidden all the comments on the files, which are not resolved. Now I can't change the review comment to unresolved 😑

Please unhide the review and look at the comments

[MetRonnie]

Also should remove any instances of time limit directives from the docs? E.g. https://github.com/cylc/cylc-flow/blob/86d24c3c1e63806590a89e75cc4202851feef1af/cylc/flow/job_runner_handlers/sge.py#L40

[wxtim]

Also should remove any instances of time limit directives from the docs? E.g.

https://github.com/cylc/cylc-flow/blob/86d24c3c1e63806590a89e75cc4202851feef1af/cylc/flow/job_runner_handlers/sge.py#L40

This appears to only be an issue for SGE where a not below tells you not to do precisely this!

n.b. Some of these directives still appear in documentation where examples of the job file show how the execution time limit will be converted to directives.

[wxtim]

The only thing it doesn't pick up on is when multiple directives are specified on the same setting, e.g.

[[[directives]]]
    -l = walltime=60:nodes=1

But otherwise I have tested and am happy with this

Not a pattern we see too often