Remove unused deps

[balloob]

Breaking change

Proposed change

Remove some unused dependencies. Found by running npx depcheck.

Some of them are not actually removed from yarn.lock as some of our existing deps rely on them.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (thank you!)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Example configuration

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.
• 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

[bramkragten]

If we remove this, "importHelpers": true, should also be removed from tsconfig? I guess it doesn't really matter because babel does our typescript work anyway...