Adds a filter that disables promoted jobs

[gikaragia]

Part of https://github.com/Automattic/greenhouse/issues/2085

Changes Proposed in this Pull Request

• Adds a filter that disables promoted jobs functionality.
• We can merge this now and set the default value to false whenever we want to disable it.

Testing Instructions

• Add the snippet add_filter('job_manager_enable_promoted_jobs', '__return_false' );
• Go through admin and observe that there is no promoted jobs functionality and no console errors:
  * Delete wp_job_manager_dismissed_notices both from the options table and the users table to reset notices
  * Publish a new job and observe that no popup is shown
  * Go to job listings and observe that no Promote button exists
• Delete the snippet, repeat the steps, and observe that promote functionality works.

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[yscik]

Looks good, just small things

[yscik]

I'm thinking it's fine to just call the filter in multiple places, no need for a new class property for this.

[gikaragia]

Hmm I am not sure I agree with this one. It will be easier to update when we change the default value. Also we will probably need to repeat the comments too if we want all filters to be documented.

[yscik]

👌