299 custom reason for application rejection

[odracir04]

the reason in the rejection email is now allowed to be specified by admins in the post request.

[render]

Your Render PR Server URL is https://nijobs-backend-pr-341.onrender.com.

Follow its progress at https://dashboard.render.com/web/srv-cljo2o98mmjc73bijve0.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.33%. Comparing base (82886d0) to head (bef70d2).

❗ Current head bef70d2 differs from pull request most recent head 47b92c2. Consider uploading reports for the commit 47b92c2 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #341      +/-   ##
===========================================
- Coverage    90.34%   90.33%   -0.01%     
===========================================
  Files           54       54              
  Lines         1470     1469       -1     
  Branches       246      245       -1     
===========================================
- Hits          1328     1327       -1     
  Misses         137      137              
  Partials         5        5              

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[odracir04]

it's worth mentioning that we had to alter the tests to include the new rejection messages but the tests cover the new code

[Naapperas]

@odracir04 please rebase and update the package-lock.json file so this PR can be reviewed.