feat: ensure GrpcClient class closure upon deletion

[RobPasMue]

Description

Ensuring the GrpcClient closure method gets called upon completion.

Issue linked

Closes #1415

Checklist

• I have tested my changes locally.
• I have added necessary documentation or updated existing documentation.
• I have followed the coding style guidelines of this project.
• I have added appropriate unit tests.
• 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 added the minimum version decorator to any new backend method implemented.
• I have made sure that the title of my PR follows Conventional commits style (e.g. feat: extrude circle to cylinder)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.85%. Comparing base (9016890) to head (51e9cc2).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1417   +/-   ##
=======================================
  Coverage   91.85%   91.85%           
=======================================
  Files          86       86           
  Lines        6873     6875    +2     
=======================================
+ Hits         6313     6315    +2     
  Misses        560      560           

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[AlejandroFernandezLuces]

LGTM