fix(frontend): replace deprecated Jira endpoint

[remarkablemark]

What is the motivation for this pull request?

fix(frontend): replace deprecated Jira endpoint

Fixes #792

https://developer.atlassian.com/changelog/#CHANGE-2046

What is the current behavior?

POST /rest/api/3/search is deprecated: https://developer.atlassian.com/cloud/jira/platform/rest/v3/api-group-issue-search/#api-rest-api-3-search-post

What is the new behavior?

Migrated to POST /rest/api/3/search/jql: https://developer.atlassian.com/cloud/jira/platform/rest/v3/api-group-issue-search/#api-rest-api-3-search-jql-post

One limitation of the new JQL endpoint is that maxResults is capped at 5,000

Checklist:

• Conventional Commits
• Tests
• Documentation

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (c1a39e1) to head (9758f3f).

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #822   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           31        31           
  Lines          324       327    +3     
  Branches        37        39    +2     
=========================================
+ Hits           324       327    +3     

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