Add an action to check that each PR has a referenced issue.

[mgreisen]

Summary of the Pull Request

What is this about?
Adds an action that will check PR's to see if there is a referenced issue.

PR Checklist

• Applies to work item: #xxx
• CLA signed. If not, go over here and sign the CLI.
• Tests added/passed
• Requires documentation to be updated
• I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan. Issue number where discussion took place: #xxx

Info on Pull Request

What does this include?

Validation Steps Performed

How does someone test & validate?

[codecov-commenter]

Codecov Report

Merging #2427 (5c537f6) into main (b647e4a) will increase coverage by 5.51%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2427      +/-   ##
==========================================
+ Coverage   29.80%   35.31%   +5.51%     
==========================================
  Files         289      135     -154     
  Lines       35029    16959   -18070     
==========================================
- Hits        10439     5989    -4450     
+ Misses      24590    10970   -13620     

Impacted Files	Coverage Δ
src/agent/coverage/src/test.rs	92.85% <0.00%> (-7.15%)	⬇️
src/agent/coverage/src/code.rs	8.29% <0.00%> (-6.12%)	⬇️
src/agent/onefuzz/src/machine_id.rs	51.21% <0.00%> (-5.63%)	⬇️
src/agent/onefuzz/src/sanitizer.rs	69.69% <0.00%> (-2.91%)	⬇️
src/agent/onefuzz-agent/src/worker/tests.rs	99.10% <0.00%> (-0.11%)	⬇️
src/agent/onefuzz/src/asan.rs	0.00% <0.00%> (ø)
src/agent/coverage/src/cache.rs	0.00% <0.00%> (ø)
src/agent/onefuzz-agent/src/setup.rs	0.00% <0.00%> (ø)
src/agent/onefuzz-agent/src/reboot.rs	0.00% <0.00%> (ø)
src/agent/onefuzz/src/input_tester.rs	0.00% <0.00%> (ø)
... and 165 more

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