[Extensions.AWSXray] Replace Newtonsoft.Json with System.Text.Json

[wjrogers]

Changes

Replace OpenTelemetry.Contrib.Extensions.AWSXRay's Newtonsoft.Json dependency with System.Text.Json. When targeting newer runtimes, this effectively removes the dependency because System.Text.Json is part of the base class library.

There are no changes to the public API, and test coverage of the affected code looks good.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: wjrogers / name: Will Rogers (f0bd7ef)

[codecov]

Codecov Report

Merging #1092 (16f56b8) into main (365e131) will decrease coverage by 2.03%.
The diff coverage is 93.75%.

❗ Current head 16f56b8 differs from pull request most recent head 4ec8bcc. Consider uploading reports for the commit 4ec8bcc to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1092      +/-   ##
==========================================
- Coverage   71.33%   69.30%   -2.03%     
==========================================
  Files         222      214       -8     
  Lines        8396     8359      -37     
==========================================
- Hits         5989     5793     -196     
- Misses       2407     2566     +159     

Impacted Files	Coverage Δ
...ns.AWSXRay/Resources/Models/AWSEBSMetadataModel.cs	100.00% <ø> (ø)
...AWSXRay/Resources/Models/AWSEKSClusterDataModel.cs	100.00% <ø> (ø)
...nsions.AWSXRay/Resources/AWSECSResourceDetector.cs	83.69% <92.30%> (-1.09%)	⬇️
...ensions.AWSXRay/Resources/ResourceDetectorUtils.cs	100.00% <100.00%> (ø)

... and 11 files with indirect coverage changes