Add optional test fixture collection to enphase_envoy diagnostic report

[catsmanac]

Proposed change

When new features are requested or firmware is upgraded it can happen that existing test fixtures no longer cover all test cases and new ones are needed. The current method is a manual one and not integrated with Home Assistant. This PR adds the option to collect test fixture collection to the enphase_envoy integration diagnostic report. The makes fixture collected by enphase_envoy owner a simple action.

An option flow has been added to the enphase_envoy config_flow. This option, disabled by default, allows the user to opt to add the test fixture to the diagnostic report when it is run.

When enabled the diagnostics report has a filled fixtures section.

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: t.b.d.

Checklist

• 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.

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 link to the changelog, or at minimum a diff between library versions is added to the PR description.
• Untested files have been added to .coveragerc.

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[home-assistant]

Hey there @bdraco, @cgarwood, @dgomes, @joostlek, mind taking a look at this pull request as it has been labeled with an integration (enphase_envoy) you are listed as a code owner for? Thanks!

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