adding more with-statements where close missing

[heikoklein]

Change Summary

Checking through the code fixing hanging filehandles. Most open_datasets have been fixed, either by using a with-clause, or by load_datasets. There are still some open_mfdatasets which I didn't manage to handle.

Related issue number

#1150
#1140

Checklist

• Start with a draft-PR
• The PR title is a good summary of the changes
• PR is set to AeroTools and a tentative milestone
• Documentation reflects the changes where applicable
• Tests for the changes exist where applicable
• Tests pass locally
• Tests pass on CI
• At least 1 reviewer is selected
• Make PR ready to review

[codecov]

Codecov Report

Attention: Patch coverage is 71.34831% with 51 lines in your changes are missing coverage. Please review.

Project coverage is 78.69%. Comparing base (5d64e25) to head (8b17ae0).
Report is 1 commits behind head on main-dev.

Files	Patch %	Lines
pyaerocom/io/read_earlinet.py	76.36%	26 Missing ⚠️
pyaerocom/colocation.py	0.00%	21 Missing ⚠️
pyaerocom/io/cachehandler_ungridded.py	69.23%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           main-dev    #1152   +/-   ##
=========================================
  Coverage     78.69%   78.69%           
=========================================
  Files           127      127           
  Lines         20090    20090           
=========================================
+ Hits          15809    15810    +1     
+ Misses         4281     4280    -1     

Flag	Coverage Δ
unittests	78.69% <71.34%> (+<0.01%)	⬆️

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[jgriesfeller]

all good