fix(github): Add ability to search labels

[schew2381]

Async search doesn't work with multi-select

1. Overrides current selection upon search
2. Doesn't reset to all labels upon exiting search
3. Looks bad

https://github.com/getsentry/sentry/assets/67301797/4c76640f-c128-4210-855f-0ad369fbf13a

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 17.64706% with 14 lines in your changes are missing coverage. Please review.

Project coverage is 80.95%. Comparing base (cc1345d) to head (7828d6c). Report is 3679 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #60950      +/-   ##
==========================================
- Coverage   80.96%   80.95%   -0.01%     
==========================================
  Files        5182     5182              
  Lines      227009   227019      +10     
  Branches    38148    38151       +3     
==========================================
- Hits       183788   183781       -7     
- Misses      37610    37626      +16     
- Partials     5611     5612       +1     

Files	Coverage Δ
src/sentry/integrations/github/issues.py	69.91% <100.00%> (ø)
src/sentry/integrations/github/client.py	84.02% <33.33%> (-0.43%)	:arrow_down:
src/sentry/integrations/github/search.py	75.43% <0.00%> (-20.22%)	:arrow_down:

... and 9 files with indirect coverage changes

[getsantry[bot]]

This issue has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you remove the label Waiting for: Community, I will leave it alone ... forever!

---

"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀

[getsantry[bot]]

This issue has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you remove the label Waiting for: Community, I will leave it alone ... forever!

---

"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀

[getsantry[bot]]

This issue has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you remove the label Waiting for: Community, I will leave it alone ... forever!

---

"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀

[getsantry[bot]]

This issue has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you remove the label Waiting for: Community, I will leave it alone ... forever!

---

"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀