fix(rc): handle null values in RC APM Tracing payloads

[dmehala]

Description

Ensures system-tests pass by properly ignoring null values APM Tracing RC payload.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.45%. Comparing base (c6185cf) to head (69dc58e).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #236   +/-   ##
=======================================
  Coverage   87.44%   87.45%           
=======================================
  Files          83       83           
  Lines        5458     5460    +2     
=======================================
+ Hits         4773     4775    +2     
  Misses        685      685           

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[pr-commenter]

Benchmarks

Benchmark execution time: 2025-09-04 12:29:02

Comparing candidate commit 69dc58e in PR branch dmehala/rc-apm-tracing-ignore-null with baseline commit c6185cf in branch main.

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

[dubloom]

LGTM