Delete unused post attachments

[jamesli12]

PR Title

Issue Number(s): #181

What does this PR change and why?

Checklist

• Requirements have been implemented
• Acceptance criteria are met
• Database schema docs have been updated or are not necessary
• Code follows design and style guidelines
• Commits follow guidelines (concise, squashed, etc)
• Relevant reviewers (Senior Dev/EM/Designers) have been assigned to this PR

Critical Changes

• Database change/migration to run
• Environment config change
• Breaking API change

Related PRs

• [Consistency] [BE] Cron job to delete unused post attachments #181

Testing

Enumerate steps to test the functionality of your ticket. This should include edge cases and testing of error handling, if applicable.

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[github-actions]

Coverage report for web

St.❔	Category	Percentage	Covered / Total
🔴	Statements	27.98%	465/1662
🔴	Branches	13.28%	64/482
🔴	Functions	15.24%	75/492
🔴	Lines	23.67%	343/1449

Test suite run success

40 tests passing in 5 suites.

Report generated by 🧪jest coverage report action from a040b88