Fix the azure logging handler in Everest

[verveerpj]

Issue
The azure logging handler in Everest was broken by a recent change.

Approach
The handler string should point to an accessible function, made the handler a global in the everserver module and adjusted the log config accordingly.

(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 'pytest tests/ert/unit_tests -n logical -m "not integration_test"')

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: Create Backport PR to latest release

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 91.85%. Comparing base (5dbaae5) to head (e936372).
Report is 3 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/everest/detached/jobs/everserver.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9402      +/-   ##
==========================================
- Coverage   91.86%   91.85%   -0.01%     
==========================================
  Files         433      433              
  Lines       26664    26665       +1     
==========================================
  Hits        24494    24494              
- Misses       2170     2171       +1     

Flag	Coverage Δ
cli-tests	39.41% <ø> (-0.01%)	⬇️
everest-models-test	34.82% <0.00%> (-0.01%)	⬇️
gui-tests	72.36% <ø> (+0.02%)	⬆️
integration-test	37.13% <80.00%> (-0.01%)	⬇️
performance-tests	52.09% <ø> (+0.02%)	⬆️
test	40.52% <80.00%> (+<0.01%)	⬆️
unit-tests	74.02% <0.00%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[DanSava]

Good job!