Adjust jobs moderation bot

[vcarl]

• Require links in HIRING posts
• Double the lifespan of a FORHIRE post to 60 hours
• Don't delete edited messages. If we hit problems with formatting evasion, we'll need to reevaluate. Edited posts still get flagged, just not deleted.
• Small copy adjustments on validation failure thread creation
• Small adjustments to support test environment

[ghost]

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[what-the-diff]

PR Summary

• Commented out a delete message line
  In src/features/jobs-moderation.ts, a piece of code that previously deleted a message has been commented out.

• Improved job mod helpers
  In src/features/jobs-moderation/job-mod-helpers.ts, several updates were made. An import for a feature named PostFailureLinkRequired was added, as well as a new function to check post failures related to the requirement of a link.

• New Tests Added
  Added a new file src/features/jobs-moderation/validate.test.ts that contains a whole test suite for the function 'links'. This function and its test cases within the suite help verify the correct operation of link-related aspects in job posts.

• Validation improvements
  File src/features/jobs-moderation/validate.ts has seen the addition of a call to a links function. This addition aims to check for errors related to missing links.

• Updated Validation messages
  In src/features/jobs-moderation/validation-messages.ts, a new error message relating to missing required links has been introduced. This addition ensures the user is informed about a specific error where a link is required in a job post.

• Environment check added
  In src/helpers/env.ts, an if condition has been added to verify if a certain environment variable (VITEST) is defined, providing a dummy response if so.

• Updated types for job moderation
  In src/types/jobs-moderation.ts, there have been several additions to support the handling of validation situations where a link is required. It's a part of the effort to ensure complete and clear validation of job posts.

[vcarl]

Hack fix for #321 in that it doesn't delete them anymore, but it's not resolved.