chore(tests): cleanup bootstrap.php to be forward-compatible

[st3iny]

Ref nextcloud/server#52951

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 22.88%. Comparing base (eb0d406) to head (f07dc35).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #7036   +/-   ##
=========================================
  Coverage     22.88%   22.88%           
  Complexity      476      476           
=========================================
  Files           252      252           
  Lines         12307    12307           
  Branches       2370     2382   +12     
=========================================
  Hits           2816     2816           
  Misses         9143     9143           
  Partials        348      348           

Flag	Coverage Δ
javascript	14.53% <ø> (ø)
php	59.33% <ø> (ø)

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[ChristophWurst]

Likely also needs a backport to maintained stable branches, because the server change was backported too

[st3iny]

Likely also needs a backport to maintained stable branches, because the server change was backported too

Nope, looks good as is. I think the backported changes in Server stable branches remain backward compatible.

Ref #7037