migrated solvers-related test to test_solvers.py

[mohitacecode]

References to other Issues or PRs

Partial fix for #18666

Brief description of what is fixed or changed

migrate all the solvers-related tests from test_matrices.py to a new created file test_solvers.py.

Other comments

Release Notes

• matrices
  • Added test_solvers.py file which contain all the solvers-related tests.

[sympy-bot]

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• matrices
  • Added test_solvers.py file which contain all the solvers-related tests. (#18737 by @mohitacecode)

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#### References to other Issues or PRs
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Partial fix for #18666

#### Brief description of what is fixed or changed
migrate all the `solvers-related tests` from `test_matrices.py`  to a new created file `test_solvers.py`.

#### Other comments


#### Release Notes

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<!-- BEGIN RELEASE NOTES -->
*   matrices
     *  Added `test_solvers.py` file which contain all the solvers-related tests.
<!-- END RELEASE NOTES -->

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The following commits add new files:

• fd7daec:
  • sympy/matrices/tests/test_solvers.py

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[sylee957]

This has merge conflicts now

[mohitacecode]

This has merge conflicts now

Okay I will solve it soon.

[sylee957]

Unfortunately, #18793 had arrived to the solution faster, so I may close this.