Nullable Hangfire

[Kielek]

Towards #894

Changes

Nullable Hangfire.
Tests project already covered.

• [ ] Appropriate CHANGELOG.md updated for non-trivial changes
• [ ] Design discussion issue #
• Changes in public API reviewed

[codecov]

Codecov Report

Merging #1352 (07a4876) into main (b3c7ae7) will increase coverage by 0.00%.
The diff coverage is n/a.

❗ Current head 07a4876 differs from pull request most recent head 462c6fd. Consider uploading reports for the commit 462c6fd to get more accurate results

@@           Coverage Diff           @@
##             main    #1352   +/-   ##
=======================================
  Coverage   73.85%   73.86%           
=======================================
  Files         266      266           
  Lines        9598     9597    -1     
=======================================
  Hits         7089     7089           
+ Misses       2509     2508    -1     

Files Changed	Coverage
...ntation.Hangfire/HangfireInstrumentationOptions.cs	ø
...ation/HangfireInstrumentationJobFilterAttribute.cs	ø
...tation.Hangfire/TracerProviderBuilderExtensions.cs	ø