chore: Adds test_segment_message to .gitignore

[mfulb]

No description provided.

[newrelic-php-agent-bot]

Test Suite	Status	Result
Multiverse	✅	8/8 passing
SOAK	✅	79/79 passing

[zsistla]

Thanks!

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.40%. Comparing base (9409457) to head (46bc869).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #1026   +/-   ##
=======================================
  Coverage   77.40%   77.40%           
=======================================
  Files         198      198           
  Lines       27715    27715           
=======================================
  Hits        21453    21453           
  Misses       6262     6262           

Flag	Coverage Δ
agent-for-php-7.2	77.53% <ø> (ø)
agent-for-php-7.3	77.55% <ø> (ø)
agent-for-php-7.4	77.26% <ø> (ø)
agent-for-php-8.0	76.65% <ø> (ø)
agent-for-php-8.1	77.16% <ø> (ø)
agent-for-php-8.2	76.77% <ø> (ø)
agent-for-php-8.3	76.77% <ø> (ø)
agent-for-php-8.4	76.79% <ø> (ø)

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