CHORE: Move mechanical-env script to PyMechanical

[dipinknair]

If pdm backend works fine, #1285 then mechanical-env script will be moved to pymechanical so that we can remove ansys-mechanical-env package

[dipinknair]

@koubaa Please note that the location of the mechanical-env script and the name of the find-mechanical file are provisional and may be updated following the review process

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -0.08% (target: -1.00%)	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (1e4f07e)	2619	2256	86.14%
Head commit (b0fe3d8)	2619 (+0)	2254 (-2)	86.06% (-0.08%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#1286)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

See your quality gate settings    Change summary preferences

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.06%. Comparing base (1e4f07e) to head (b0fe3d8).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1286      +/-   ##
==========================================
- Coverage   86.13%   86.06%   -0.08%     
==========================================
  Files          40       40              
  Lines        2619     2619              
==========================================
- Hits         2256     2254       -2     
- Misses        363      365       +2     

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.