Apply instantiators to auto_cli class components and make instantiators keyword-only

[mauvilsa]

What does this PR do?

Follow-up to #994

• auto_cli built class components directly, so custom instantiators never reached them. This applied to return_instance=True and to class-method subcommands. They now go through the instantiators passed to auto_cli and the global ones.
• auto_cli now gives the instantiators to instantiate as context instead of as a keyword. A parser_class that overrides instantiate with the old signature therefore keeps working when instantiators is given.
• instantiators is now keyword-only in ArgumentParser.instantiate, auto_cli and FromConfigMixin.from_config. Since v4.53.0 is unreleased, this breaks nothing, and v5 keeps the same signature.

Before submitting

• Did you read the contributing guideline?
• If you used a coding agent, did you fully understand and validate all generated code and ensure it follows the contributing guidelines?
• [n/a] Did you update the documentation? (readme and public docstrings)
• Did you write unit tests such that there is 100% coverage on related code? (required for bug fixes and new features)
• Did you verify that new and existing tests pass locally?
• If this is a bug fix, did you verify that the tests fail without the code fix?
• Did you make sure that all changes preserve backward compatibility?
• Did you update the CHANGELOG including a pull request link? (not for typos, docs, test updates, or minor internal changes/refactors)

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (bc5d73c) to head (7c57311).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff            @@
##                v4      #996   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           28        28           
  Lines         9457      9462    +5     
=========================================
+ Hits          9457      9462    +5     

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[greptile-apps]

Confidence Score: 5/5

[Medium risk] Changes how instantiators are passed to CLI and config functions.

The PR appears safe to merge; no actionable regression was established.

Summary

This PR routes auto_cli class-component construction through custom instantiators and makes the newly introduced instantiators parameters keyword-only.

• Passes call-scoped instantiators through parser context so parser subclasses with older instantiate overrides remain compatible.
• Adds coverage for class returns, class-method subcommands, global instantiators, and context isolation.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  A[auto_cli] --> B[Parse arguments]
  B --> C[Instantiate parsed configuration]
  C --> D{Class component?}
  D -->|Yes| E[Select scoped, parser, or global instantiator]
  E --> F[Construct class and optionally invoke method]
  D -->|No| G[Invoke function component]

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