fix: avoid changing entities ids after plotting

[germa89]

Description

Avoid plotting changing the id of the returned elements.

Issue linked

Close #3372
Close #3374

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)

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[codecov]

Codecov Report

Attention: Patch coverage is 63.33333% with 11 lines in your changes missing coverage. Please review.

Project coverage is 65.85%. Comparing base (2d63da1) to head (894f839).
Report is 3 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (2d63da1) and HEAD (894f839). Click for more details.

HEAD has 232 uploads less than BASE

Flag	BASE (2d63da1)	HEAD (894f839)
latest-ubuntu-student	6	1
student	18	3
dmp	34	7
minimal	14	7
ubuntu	42	7
local	28	7
v24.2-ubuntu-student	6	1
v24.1-ubuntu-student	6	1
smp	18	0
remote	24	0
non-student	34	4
v24.2-ubuntu	6	1
v23.2.0	2	0
centos	10	0
v24.2.0	2	0
latest-ubuntu	6	1
v23.2-ubuntu	6	1
v24.1-ubuntu	6	1
v24.1.0	2	0
v23.1.0	2	0
v25.1.0	2	0

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #3421       +/-   ##
===========================================
- Coverage   85.13%   65.85%   -19.29%     
===========================================
  Files          55       55               
  Lines        9963     9951       -12     
===========================================
- Hits         8482     6553     -1929     
- Misses       1481     3398     +1917