fix _has_role support check

[remollemo]

This change is 

[cursor]

PR Summary

Low Risk
Low risk: a small change to error-string matching that only affects when the script falls back from has_role to legacy role-check entrypoints; main risk is misclassifying unrelated errors as “missing entrypoint.”

Overview
Improves role_discovery.py’s detection of “missing entrypoint” failures by loosening _is_missing_entrypoint_error to match any error message containing both entry and point.

This makes the has_role support probe and runtime checks more likely to correctly fall back to legacy is_<role> entrypoints when RPC/provider error wording differs.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

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  Hits            ?     3781           
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[cursor]

Cursor Bugbot has reviewed your changes and found 2 potential issues.

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[noa-starkware]

@noa-starkware made 1 comment.
Reviewable status: 0 of 1 files reviewed, 2 unresolved discussions (waiting on remollemo).

[remollemo]

@remollemo reviewed 1 file and all commit messages, and resolved 2 discussions.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on remollemo).

[remollemo]

@remollemo reviewed 1 file and all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on remollemo).