Change wake word interception to a subscription

[synesthesiam]

Breaking change

Proposed change

Modifies the assist_satellite/intercept_wake_word websocket command to be a subscription instead. This will allow it to be cancelled within the UI. Additionally, starting a second interception will cancel the first one.

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 #
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[home-assistant]

Hey there @home-assistant/core, mind taking a look at this pull request as it has been labeled with an integration (assist_satellite) you are listed as a code owner for? Thanks!

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[MartinHjelmare]

We shouldn't merge this until frontend confirms they are happy.

Also, please complete the tests.

[synesthesiam]

Test failure appears unrelated

[MartinHjelmare]

Thanks!

Can be merged once approved by frontend.