fix(agent): address the aws-sdk-php versioning change

[zsistla]

Concerns about future/past proofing to the checking prioritized the non-eval implementation vs using the eval method for checking the version. However, aws-sdk-php internal functions frequently change without notice in the release notes. An extra eval is used to avoid the fatal error that would occur in the VERY unlikely event of Aws/Sdk.php not being found and which addresses the previous concerns while decoupling versioning from internal functions.

[newrelic-php-agent-bot]

Test Suite	Status	Result
Multiverse	✅	7/7 passing
SOAK	✅	62/62 passing

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 71.42857% with 2 lines in your changes missing coverage. Please review.

Project coverage is 78.61%. Comparing base (aae7611) to head (4804f93).

Files with missing lines	Patch %	Lines
agent/lib_aws_sdk_php.c	71.42%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #1001   +/-   ##
=======================================
  Coverage   78.60%   78.61%           
=======================================
  Files         196      196           
  Lines       27076    27069    -7     
=======================================
- Hits        21283    21280    -3     
+ Misses       5793     5789    -4     

Flag	Coverage Δ
agent-for-php-7.2	78.62% <71.42%> (+<0.01%)	⬆️
agent-for-php-7.3	78.64% <71.42%> (+<0.01%)	⬆️
agent-for-php-7.4	78.34% <71.42%> (+<0.01%)	⬆️
agent-for-php-8.0	78.36% <71.42%> (+<0.01%)	⬆️
agent-for-php-8.1	78.35% <71.42%> (+<0.01%)	⬆️
agent-for-php-8.2	77.94% <71.42%> (+<0.01%)	⬆️
agent-for-php-8.3	77.94% <71.42%> (+<0.01%)	⬆️

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[lavarou]

LGTM. Thanks for fixing this!