FIX: Embedding message get test

[dipinknair]

The failing test uses one of the mechdb to get message from Mechanical which is not consistent with the new version of Mechanical. It is replaced with another mechdb that we use in tests.
closes #1170

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00% (target: -1.00%)	✅ ∅

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (e1c5788)	2537	2191	86.36%
Head commit (ebc19f5)	2537 (+0)	2191 (+0)	86.36% (+0.00%)

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 (#1174)	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%

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.36%. Comparing base (e1c5788) to head (ebc19f5).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1174   +/-   ##
=======================================
  Coverage   86.36%   86.36%           
=======================================
  Files          39       39           
  Lines        2537     2537           
=======================================
  Hits         2191     2191           
  Misses        346      346           

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[dipinknair]

https://github.com/ansys/pymechanical/actions/runs/15187653847
passing with 252.