Add date to cset plot menu items

[mo-sanamahmood]

Adding in the date to the CSET plots menu

Contribution checklist

Aim to have all relevant checks ticked off before merging. See the developer's guide for more detail.

• Documentation has been updated to reflect change.
• New code has tests, and affected old tests have been updated.
• All tests and CI checks pass.
• Ensured the pull request title is descriptive.
• Conda lock files have been updated if dependencies have changed.
• Attributed any Generative AI, such as GitHub Copilot, used in this PR.
• Marked the PR as ready to review.

[jfrost-mo]

Looks good to me.

[jfrost-mo]

Ah, the tests are failing because the space should only be added if the date is.

[jfrost-mo]

Suggested change

	plot_metadata["category"]: {
	directory.name: plot_metadata["title"]
	+ " "
	+ os.getenv("CYLC_TASK_CYCLE_POINT", "")
	}
	plot_metadata["category"]: {
	directory.name: plot_metadata["title"]
	+ " "
	+ os.getenv("CYLC_TASK_CYCLE_POINT", "")
	}.strip()

This will strip any trailing spaces. Once the change is made ping it back to me and I'll re-review.