Convert ecobee pressure to local units

[rianadon]

Proposed change

Convert the pressure in the Ecobee weather integration to metric/imperial depending on what Home Assistant is configured to use. This is the same behavior as the OpenWeatherMap (code) and Climacell (code) weather integrations.

The pressure units from Ecobee API are undocumented, but they look like hPa or millibars (both are equal so I just chose hPa in the code). See #24524 as well.

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

Additional information

• This PR fixes or closes issue: fixes Ecobee weather pressure units incorrect #29947

⚠️ There many many more weather integrations that do not convert their pressure units to the correct format. There is probably a better solution than making each integration convert to the correct pressure unit: Something like #48641 seems like it could help.

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.

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.
• Untested files have been added to .coveragerc.

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To help with the load of incoming pull requests:

• I have reviewed two other open pull requests in this repository.

[probot-home-assistant]

Hey there @marthoc, mind taking a look at this pull request as its been labeled with an integration (ecobee) you are listed as a codeowner for? Thanks!
_{^{(message by CodeOwnersMention)}}

[MartinHjelmare]

Thanks!

[bjpetit]

Looks Good.