refactor: enhance sys method type hints and clean up return value

[germa89]

Description

As the title.

Issue linked

NA but extracted from #1300.

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)

Summary by Sourcery

Refine the sys method by adding type hints and ensuring the returned output has no trailing newline

Enhancements:

• Add cmd: str parameter and -> str return type hints to sys
• Trim a single trailing newline from the sys method’s return value if present

[ansys-reviewer-bot]

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@ansys-reviewer-bot review

[sourcery-ai]

Reviewer's Guide

Refactors sys method by adding explicit type hints for cmd and return type and ensures trailing newline is removed from returned output.

File-Level Changes

Change	Details	Files
Enhanced sys method type hints	Added parameter type hint cmd: str Added return type annotation -> str	src/ansys/mapdl/core/mapdl_grpc.py
Cleaned up return value	Strips trailing newline character from returned obj Added explanatory comment for newline removal	src/ansys/mapdl/core/mapdl_grpc.py

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[germa89]

@pyansys-ci-bot LGTM.

[sourcery-ai]

Hey @germa89 - I've reviewed your changes and they look great!

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[Copilot]

Pull Request Overview

Refactors the sys method by adding type hints and ensuring the returned output doesn’t end with a newline.

• Added cmd: str and -> str type annotations to sys
• Updated return logic to strip a single trailing newline from the command output

Comments suppressed due to low confidence (2)

src/ansys/mapdl/core/mapdl_grpc.py:1475

• [nitpick] The docstring should mention that the returned string has a trailing newline removed. Document the newline-stripping behavior to keep consumers informed.

    def sys(self, cmd: str, **kwargs) -> str:

src/ansys/mapdl/core/mapdl_grpc.py:1475

• [nitpick] The method name sys shadows Python's built-in sys module. Consider renaming to reduce confusion or explicitly document its purpose.

    def sys(self, cmd: str, **kwargs) -> str:

[pyansys-ci-bot]

✅ Approving this PR because germa89 said so in here 😬

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.85%. Comparing base (a9d37dc) to head (6d270fc).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4099      +/-   ##
==========================================
+ Coverage   91.82%   91.85%   +0.02%     
==========================================
  Files         187      187              
  Lines       15033    15033              
==========================================
+ Hits        13804    13808       +4     
+ Misses       1229     1225       -4     

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