MAINT: Remove tests and doc dependencies from project.toml

[lboucin]

• Poetry fails to create a new python 3.9.10 env based on current project.toml due to conflicting dependencies found in tests (numpy + pandas) and doc groups (ansys-fluent-core + ansys-fluent-visualization). Since these dependencies are redundant with the folder requirements that is the one actually used in the github workflows to setup tests and doc actions, I suggest we remove this redundancy.
  Impact for developers is these dependencies should now be manually added on top of the python env created with poetry, in order to run unit tests and doc build locally.
• FIX Make SavedState id to be unique to fix occasionally failing unit test.

[codecov-commenter]

Codecov Report

Merging #81 (654e44e) into main (0aa6d17) will decrease coverage by 0.28%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #81      +/-   ##
==========================================
- Coverage   87.23%   86.95%   -0.28%     
==========================================
  Files           9        9              
  Lines        1794     1794              
==========================================
- Hits         1565     1560       -5     
- Misses        229      234       +5     

[chrpetre]

lgtm thanks