data grand lyon: implement reauth

[Crocmagnon]

Proposed change

Implement reauth flow for data grand lyon.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request:
• Link to developer documentation pull request:
• Link to frontend pull request:

Checklist

• I understand the code I am submitting and can explain how it works.
• The code change is tested and works locally.
• Local tests pass. Your PR cannot be merged unless tests pass
• There is no commented out code in this PR.
• I have followed the development checklist
• I have followed the perfect PR recommendations
• The code has been formatted using Ruff (ruff format homeassistant tests)
• Tests have been added to verify that the new code works.
• Any generated code has been carefully reviewed for correctness and compliance with project standards.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io

If the code communicates with devices, web services, or third-party tools:

• The manifest file has all fields filled out correctly.
  Updated and included derived files by running: python3 -m script.hassfest.
• New or updated dependencies have been added to requirements_all.txt.
  Updated by running python3 -m script.gen_requirements_all.
• For the updated dependencies a diff between library versions and ideally a link to the changelog/release notes is added to the PR description.

To help with the load of incoming pull requests:

• I have reviewed two other open pull requests in this repository.

[Copilot]

Pull request overview

This PR adds a reauthentication path for the data_grand_lyon integration so Home Assistant can prompt the user to re-enter credentials when the upstream service returns an authorization error.

Changes:

• Raise ConfigEntryAuthFailed from the coordinator on HTTP 401/403 responses to trigger a reauth flow.
• Add reauth / reauth_confirm steps to the integration config flow and related translations.
• Add/extend tests to validate both setup-triggered reauth and the reauth config flow (success + error paths), and mark the quality scale rule as done.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
homeassistant/components/data_grand_lyon/coordinator.py	Detects auth failures (401/403) during updates and raises ConfigEntryAuthFailed to trigger reauth.
homeassistant/components/data_grand_lyon/config_flow.py	Implements async_step_reauth / async_step_reauth_confirm to update credentials via UI.
homeassistant/components/data_grand_lyon/strings.json	Adds translation keys for reauth step and success abort reason.
homeassistant/components/data_grand_lyon/quality_scale.yaml	Marks the reauthentication-flow rule as completed.
tests/components/data_grand_lyon/test_init.py	Adds a test asserting setup triggers a reauth flow on auth failure.
tests/components/data_grand_lyon/test_config_flow.py	Adds tests for reauth flow success and error handling/recovery.

[zweckj]

because the rest of the file already uses that syntax, I will let it slide, but it would be better to use a fixture for that instead, to reduce indent and save code

[Crocmagnon]

Thank you for the feedback, I’ll clean that up in a future PR.