fix(script): updates search-issue-refs to group references by issue and output markdown

[arya2]

Motivation

It's more convenient to view all references to a closed issue at once.

Solution

• Group references by issue
• Only output issue ids and permalinks to where they were found in the repo

Review

This is optional priority, anyone can review.

Reviewer Checklist

• Will the PR name make sense to users?
  • Does it need extra CHANGELOG info? (new features, breaking changes, large changes)
• Are the PR labels correct?
• Does the code do what the ticket and PR says?
  • Does it change concurrent code, unsafe code, or consensus rules?
• How do you know it works? Does it have tests?

[codecov]

Codecov Report

Merging #6444 (4a5ba21) into main (5db2243) will increase coverage by 0.17%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6444      +/-   ##
==========================================
+ Coverage   77.78%   77.95%   +0.17%     
==========================================
  Files         304      304              
  Lines       39637    39637              
==========================================
+ Hits        30833    30901      +68     
+ Misses       8804     8736      -68     

[oxarbitrage]

I think this is better, thanks for adjusting it. Just an issue with the permalink that i think we should change but it maybe has a reason i am not seeing. Feel free to clarify and merge.