Add 'Don't show this again' link to dismiss promote job modal in the editor

[yscik]

Fixes #2523

Changes Proposed in this Pull Request

• Update the notice system to accommodate this modal as a notice
• Add a 'Don't show this again' link to the modal that marks the notice as dismissed for the current user
• Don't show the modal after it was dismissed

Testing Instructions

• Create a new job listing, add title, and hit Publish
• A 'Promote your job on our partner network' modal should pop up
• Click 'Don't show this again' link. Modal should disappear.
• Publish another job listing. Modal should not appear.
  --
• To restore dismissed notices:
  • wp user meta delete 1 wp_job_manager_dismissed_notices (where 1 is the user ID)
  • wp option delete wp_job_manager_dismissed_notices for site-level notices
• Double-check that dismissing regular notices keeps working
  --
• Open the job listing page, and click on a Promote button
• Check that the Don't show this again link is not showing

Release Notes

• Fix: Add 'Don't show this again' link to dismiss promote job modal in the editor

Screenshot / Video

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[gikaragia]

Looks great overall! Left a few comments.

[gikaragia]

Looks good works well!