fix: migrated (PR 4146): Set _post as a property so it's initialized when needed

[pyansys-ci-bot]

This PR is a mirror pull request created from fix: Set _post as a property so it's initialized when needed to allow the code to access PyMAPDL CICD secrets.

Check the original PR made by @valallansys for more details.

Closes #4146

Original pull request

fix: Set _post as a property so it's initialized when needed

Description

We had an issue in mapdl using *PYT command which starts a python interpreter and imports mapdl as mapdlInProcess.
Then calling mapdl.dict led to a segmentation error because it called PostProcessing whithout results. We figured we didn't need to initialise _post unless needed

Issue linked

#4145

Checklist

• I have visited and read Develop PyMAPDL.
• I have tested my changes locally
• I have added necessary documentation or updated existing documentation.
• I have followed the PyMAPDL coding style guidelines.
• I have added appropriate unit tests that also ensure the minimal coverage criteria.
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved to the PR if any.
• I have assigned this PR to myself.
• I have marked this PR as draft if it is not ready to be reviewed yet.
• I have made sure that the title of my PR follows Commit naming conventions (e.g. feat: adding new MAPDL command)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.31%. Comparing base (514cfae) to head (f5e2696).
⚠️ Report is 12 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4147   +/-   ##
=======================================
  Coverage   91.30%   91.31%           
=======================================
  Files         189      193    +4     
  Lines       15698    15724   +26     
=======================================
+ Hits        14333    14358   +25     
- Misses       1365     1366    +1     

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[germa89]

@valallansys please can you have a look at this?