[NO-TICKET] Switch system-tests to main branch

[Strech]

What does this PR do?

Return system-tests branch to main

Motivation:

This is post-release treatment

Change log entry

No.

Additional Notes:

None.

How to test the change?

CI.

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-04-03 09:16:55

Comparing candidate commit e42e9ee in PR branch switch-system-tests-to-master with baseline commit 157982b in branch master.

Found 1 performance improvements and 0 performance regressions! Performance is the same for 30 metrics, 2 unstable metrics.

scenario:tracing - Propagation - Trace Context

• 🟩 throughput [+4354.131op/s; +4463.712op/s] or [+12.943%; +13.269%]

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.76%. Comparing base (157982b) to head (e42e9ee).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4556      +/-   ##
==========================================
- Coverage   97.77%   97.76%   -0.02%     
==========================================
  Files        1396     1396              
  Lines       85867    85867              
  Branches     4329     4329              
==========================================
- Hits        83957    83948       -9     
- Misses       1910     1919       +9     

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[datadog-datadog-prod-us1]

Datadog Report

Branch report: switch-system-tests-to-master
Commit report: e42e9ee
Test service: dd-trace-rb

✅ 0 Failed, 20798 Passed, 1374 Skipped, 3m 14.48s Total Time