Rename ertserver

[berland]

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')

[codecov-commenter]

Codecov Report

❌ Patch coverage is 85.62092% with 22 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.64%. Comparing base (fcad14a) to head (0908812).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/ert/services/ert_server.py	88.03%	14 Missing ⚠️
src/ert/__main__.py	25.00%	3 Missing ⚠️
src/everest/detached/everserver.py	50.00%	2 Missing ⚠️
src/ert/gui/main.py	50.00%	1 Missing ⚠️
src/ert/shared/storage/connection.py	50.00%	1 Missing ⚠️
src/everest/gui/main_window.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12622      +/-   ##
==========================================
+ Coverage   90.54%   90.64%   +0.10%     
==========================================
  Files         435      430       -5     
  Lines       30043    29773     -270     
==========================================
- Hits        27201    26987     -214     
+ Misses       2842     2786      -56     

Flag	Coverage Δ
cli-tests	37.43% <29.71%> (+0.10%)	⬆️
gui-tests	69.14% <73.91%> (+0.52%)	⬆️
performance-and-unit-tests	73.87% <81.04%> (-0.04%)	⬇️
test	38.10% <35.29%> (+0.06%)	⬆️

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[codspeed-hq]

CodSpeed Performance Report

Merging this PR will not alter performance

_{Comparing berland:rename_ertserver (0908812) with main (87e6aa7)}

Summary

✅ 22 untouched benchmarks