refactor(agent): improve magic file recognition performance

[lavarou]

Speed up speed package detection by performing a suffix match on the 'magic' file pattern with case insensitive string comparison instead of a substring search within a lowercased filename. This is possible because all of the 'magic' file search patterns patterns are right anchored.

Fixup of e11b992 with changes from 24c1c65.

[newrelic-php-agent-bot]

Test Suite	Status	Result
Multiverse	✅	7/7 passing
SOAK	✅	56/56 passing

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.54%. Comparing base (aa15a2d) to head (30fac1a).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #970   +/-   ##
=======================================
  Coverage   78.53%   78.54%           
=======================================
  Files         196      196           
  Lines       27108    27103    -5     
=======================================
- Hits        21290    21287    -3     
+ Misses       5818     5816    -2     

Flag	Coverage Δ
agent-for-php-7.2	78.55% <100.00%> (+<0.01%)	⬆️
agent-for-php-7.3	78.57% <100.00%> (+<0.01%)	⬆️
agent-for-php-7.4	78.27% <100.00%> (+<0.01%)	⬆️
agent-for-php-8.0	78.29% <100.00%> (+<0.01%)	⬆️
agent-for-php-8.1	78.28% <100.00%> (+<0.01%)	⬆️
agent-for-php-8.2	77.87% <100.00%> (+<0.01%)	⬆️
agent-for-php-8.3	77.87% <100.00%> (+<0.01%)	⬆️

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[zsistla]

nice optimization