fix(spotlight): Don't give up on Spotlight on 3 errors

[BYK]

Current Spotlight error handling logic gives up sending events to Spotlight after 3 errors. This doesn't make much sense because:

1. Since there is no back off or retry mechanism, even a very brief server hiccup or restart turns off Spotlight reporting
2. Once this shut off kicks in, there is no way to turn it back on except for a server restart

I added a note for future work for retries and some short buffer.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.94%. Comparing base (5891717) to head (b9c47db).
Report is 2 commits behind head on master.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #3856       +/-   ##
===========================================
+ Coverage   66.07%   79.94%   +13.87%     
===========================================
  Files         137      137               
  Lines       15403    15399        -4     
  Branches     2618     2617        -1     
===========================================
+ Hits        10177    12311     +2134     
+ Misses       4346     2217     -2129     
+ Partials      880      871        -9     

Files with missing lines	Coverage Δ
sentry_sdk/spotlight.py	56.36% <ø> (+1.10%)	⬆️

... and 42 files with indirect coverage changes