Fix saving ingress data on supervisor shutdown

[mdegat01]

Proposed change

#4152 broke supervisor's ability to save ingress session data on shutdown because it puts dataclasses directly into _data and validation expects dictionaries. Fix this by ensuring _data is always a serializable dictionary representation of ingress data and converting to the dataclasses as necessary in methods.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (which adds functionality to the supervisor)
• 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 Can't parse data: expected a dictionary for dictionary value @ data['session_data'] #4671
• This PR is related to issue:
• Link to documentation pull request:
• Link to cli pull request:

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
• The code has been formatted using Black (black --fast supervisor tests)
• Tests have been added to verify that the new code works.

If API endpoints of add-on configuration are added/changed:

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