🔧 Only enable IPO per default for Release builds outside of deployment

[burgholzer]

Description

Basically the PR title. From past experience, IPO can make debugging quite hard.
This PR ensures that, at least in non-release builds, IPO is not enabled by default.
As such, no manual workarounds should be necessary anymore for debugging.

This change transitively propagates to all dependants of MQT Core once they update to the latest version.

@ystade tagging for awareness

Checklist:

• The pull request only contains commits that are related to it.
• I have added appropriate tests and documentation.
• I have made sure that all CI jobs on GitHub pass.
• The pull request introduces no new warnings and follows the project's style guidelines

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.3%. Comparing base (fc6bb4b) to head (e47e6d1).
Report is 2 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #841   +/-   ##
=====================================
  Coverage   92.3%   92.3%           
=====================================
  Files        127     127           
  Lines      13556   13555    -1     
  Branches    2086    2086           
=====================================
+ Hits       12520   12521    +1     
+ Misses      1036    1034    -2     

Flag	Coverage Δ
cpp	92.1% <ø> (+<0.1%)	⬆️
python	99.7% <ø> (ø)

see 1 file with indirect coverage changes