More coverage

[blink1073]

• Add coverage report config to ignore common patterns
• Actually install pandoc on Ubuntu to improve nbconvert coverage
• Add more utils coverage
• Add shutdown_server coverage and include integration tests in overall coverage

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 75.14%. Comparing base (ca3c5b2) to head (dd46f62).
Report is 300 commits behind head on main.

Files with missing lines	Patch %	Lines
jupyter_server/serverapp.py	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1067      +/-   ##
==========================================
+ Coverage   73.89%   75.14%   +1.25%     
==========================================
  Files          64       63       -1     
  Lines        8267     8225      -42     
  Branches     1640     1635       -5     
==========================================
+ Hits         6109     6181      +72     
+ Misses       1745     1624     -121     
- Partials      413      420       +7     

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