feat(agent): remove support for PHPs 7.0 and 7.1

[bduranleau-nr]

EOL PHP 7.0 & 7.1 Support.

[newrelic-php-agent-bot]

Test Suite	Status	Result
Multiverse	✅	9/9 passing
SOAK	❌	55/56 passing

[zsistla]

Can also remove this clause: https://github.com/newrelic/newrelic-php-agent/pull/907/files#diff-3c1e3ffee56642b2a90c941707a5ae7f973bda43f91dc3788e8873e95cdec381R116

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.16%. Comparing base (c1a48d0) to head (e896291).

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #907      +/-   ##
==========================================
- Coverage   78.56%   78.16%   -0.41%     
==========================================
  Files         193      193              
  Lines       27293    26802     -491     
==========================================
- Hits        21444    20950     -494     
- Misses       5849     5852       +3     

Flag	Coverage Δ
agent-for-php-7.0	?
agent-for-php-7.1	?
agent-for-php-7.2	78.16% <ø> (ø)
agent-for-php-7.3	78.18% <ø> (ø)
agent-for-php-7.4	77.89% <ø> (ø)
agent-for-php-8.0	77.91% <ø> (ø)
agent-for-php-8.1	77.90% <ø> (ø)
agent-for-php-8.2	77.49% <ø> (ø)
agent-for-php-8.3	77.49% <ø> (ø)

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[lavarou]

PHPs 7.0 and 7.1 need to be deprecated before being EOLed.