Renaming mapdl.mode to mapdl.connection

[germa89]

Because conflict to MAPDL command MODE.

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[codecov]

Codecov Report

Merging #2431 (2c50fdd) into main (32743f0) will decrease coverage by 0.05%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #2431      +/-   ##
==========================================
- Coverage   81.93%   81.88%   -0.05%     
==========================================
  Files          44       44              
  Lines        8453     8453              
==========================================
- Hits         6926     6922       -4     
- Misses       1527     1531       +4     

[github-actions]

Hello! 👋

Your PR is changing the image cache. So I am attaching the new image cache
in a new commit.

This commit does not re-run the CICD workflows (since no changes are made in the codebase) therefore
you will see the actions showing in their status Expected — Waiting for status to be reported. Do not worry.
You commit workflow is still running here 😄

You might want to rerun the test to make sure that everything is passing. You can retrigger the CICD sending an empty commit git commit -m "Empty comment to trigger CICD" --allow-empty.

You will see this message everytime your commit changes the image cache but you are not attaching the updated cache. 🤓