fix(cbl_sentry): use parentSamplingDecision

[blaugold]

No description provided.

[codecov]

Codecov Report

Merging #418 (1ed7f14) into main (3443d41) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##             main     #418   +/-   ##
=======================================
  Coverage   89.27%   89.27%           
=======================================
  Files         144      144           
  Lines       10087    10087           
=======================================
  Hits         9005     9005           
  Misses       1082     1082           

Flag	Coverage Δ
e2e.cbl	89.09% <ø> (ø)
unit.cbl	2.85% <ø> (ø)
unit.cbl_dart	16.00% <ø> (ø)
unit.cbl_generator	31.62% <ø> (ø)
unit.cbl_sentry	9.41% <0.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...es/cbl_sentry/lib/src/sentry_tracing_delegate.dart	94.17% <0.00%> (ø)

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