[bugfix] Fix performance logging when perf_variables are set in a performance stage hook

[vkarak]

Fixes #2728.

[codecov-commenter]

Codecov Report

Base: 86.61% // Head: 86.61% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (95be685) compared to base (d558e58).
Patch coverage: 100.00% of modified lines in pull request are covered.

❗ Current head 95be685 differs from pull request most recent head 16421b9. Consider uploading reports for the commit 16421b9 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2751      +/-   ##
==========================================
- Coverage   86.61%   86.61%   -0.01%     
==========================================
  Files          60       60              
  Lines       11215    11213       -2     
==========================================
- Hits         9714     9712       -2     
  Misses       1501     1501              

Impacted Files	Coverage Δ
reframe/core/logging.py	80.99% <100.00%> (-0.04%)	⬇️
reframe/frontend/executors/__init__.py	97.63% <100.00%> (-0.01%)	⬇️

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