Remove ErtPluginManager arg from main fns

[yngve-sk]

added manual call to pass the global
logger to consumer plugins

Issue
Resolves #my_issue

Approach
Short description of the approach

(Screenshot of new behavior in GUI if applicable)

• PR title captures the intent of the changes, and is fitting for release notes.
• Added appropriate release note label
• Commit history is consistent and clean, in line with the contribution guidelines.
• Make sure unit tests pass locally after every commit (git rebase -i main --exec 'just rapid-tests')

When applicable

• When there are user facing changes: Updated documentation
• New behavior or changes to existing untested code: Ensured that unit tests are added (See Ground Rules).
• Large PR: Prepare changes in small commits for more convenient review
• Bug fix: Add regression test for the bug
• Bug fix: Add backport label to latest release (format: 'backport release-branch-name')

[codspeed-hq]

CodSpeed Performance Report

Merging #11803 will not alter performance

_{Comparing yngve-sk:25.09.remove-pm-arg (d6b6313) with main (328ce8b)}

Summary

✅ 22 untouched

[codecov-commenter]

Codecov Report

❌ Patch coverage is 88.88889% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.67%. Comparing base (328ce8b) to head (d6b6313).

Files with missing lines	Patch %	Lines
src/ert/__main__.py	80.00%	1 Missing ⚠️
src/ert/gui/main.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11803      +/-   ##
==========================================
- Coverage   90.70%   90.67%   -0.03%     
==========================================
  Files         431      431              
  Lines       29606    29602       -4     
==========================================
- Hits        26853    26841      -12     
- Misses       2753     2761       +8     

Flag	Coverage Δ
cli-tests	37.69% <38.88%> (+<0.01%)	⬆️
gui-tests	68.77% <83.33%> (+<0.01%)	⬆️
performance-and-unit-tests	74.14% <88.88%> (+<0.01%)	⬆️
test	38.43% <0.00%> (+0.01%)	⬆️

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