chore: prefix system tests env vars

[wconti27]

Description

Prefix system tests env vars to not conflict with local dev env vars.

Reviewer checklist

• Test coverage seems ok.
• Appropriate labels assigned.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.41%. Comparing base (b8fde57) to head (925edd6).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2868      +/-   ##
============================================
- Coverage     80.97%   78.41%   -2.57%     
  Complexity     2526     2526              
============================================
  Files           146      173      +27     
  Lines         14683    18713    +4030     
  Branches          0      976     +976     
============================================
+ Hits          11889    14673    +2784     
- Misses         2794     3503     +709     
- Partials          0      537     +537     

Flag	Coverage Δ
appsec-extension	69.08% <ø> (?)
tracer-extension	78.26% <ø> (ø)
tracer-php	82.10% <ø> (ø)

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see 27 files with indirect coverage changes

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