Support Rest sensor XML responses that don't have an XML content type set

[khcnz]

Proposed change

Currently the rest sensor parses the returned result content as xml rather than json when the content-type is 'correctly' set by a server to include one of a set of specified xml mime types (such as text/xml).

This change extends this matching logic to also also look so see if the file extension ends in xml, or if the content starts with <?xml version="1.0" in order to support less compliant servers that are returning xml results without setting a 'correct' mime type (which I have come across).

It's unlikely this would be a breaking change for anyone as the current code falls back to parsing as json if an xml conversion fails.

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: Proposed changes for Rest Sensor to better detect XML responses home-assistant.io#32840

Checklist

• The code change is tested and works locally.
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• Tests have been added to verify that the new code works.

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[home-assistant]

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