Refactor client tests, deprecate addProtocolIfNotPresent, fix abort bug, adjust documentation

[flevi29]

Pull Request

Related issue

Fixes #1922

What does this PR do?

• some index tests were removed, which should be covered by Improve indexes #1918
• TODO

PR checklist

Please check if your PR fulfills the following requirements:

• Does this PR fix an existing issue, or have you listed the changes applied in the PR description (and why they are needed)?
• Have you read the contributing guidelines?
• Have you made sure that the title is accurate and descriptive of the changes?

Thank you so much for contributing to Meilisearch!

[codecov]

Codecov Report

Attention: Patch coverage is 84.21053% with 6 lines in your changes missing coverage. Please review.

Project coverage is 97.78%. Comparing base (7da269f) to head (4fea08f).

Files with missing lines	Patch %	Lines
src/utils.ts	33.33%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1926      +/-   ##
==========================================
- Coverage   99.02%   97.78%   -1.25%     
==========================================
  Files          18       18              
  Lines        1435     1442       +7     
  Branches      303      301       -2     
==========================================
- Hits         1421     1410      -11     
- Misses         14       32      +18     

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