UniFi - refactor entity management

[Kane610]

Breaking change

Proposed change

Revisit all of entity management of UniFi integration based on @MartinHjelmare feedback in #34307

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)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example entry for configuration.yaml:

# Example configuration.yaml

Additional information

• This PR fixes or closes issue: fixes #
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• Link to documentation 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 homeassistant tests)
• Tests have been added to verify that the new code works.

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  Updated and included derived files by running: python3 -m script.hassfest.
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  Updated by running python3 -m script.gen_requirements_all.
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[Kane610]

@MartinHjelmare this is a draft of just sensor platform to get feedback from you if this is more in line with what you requested in #34307

[MartinHjelmare]

Looks good!

[MartinHjelmare]

Awesome!

[Kane610]

@MartinHjelmare fixed. Thanks! Will merge when tests pass unless you have additional comments