Add autocomplete to onboarding, cloud, and password change

[steverep]

Proposed change

Gets the ball rolling on supporting the autocomplete attribute for various text fields:

• Creates support for it in ha-textfield (not supported by mwc-textfield)
• Adds it to the text selector
• Adds it in several locations:
  • Onboarding create user
  • Password change in profile & admin
  • Cloud login & register

Notes

• I'll work on the auth and MFA flows next - just a bit trickier since the schema comes from core.
• I did not add it to the add user dialog because that still uses paper-input.
• This will enable autofill support for anything webkit-based since it supports shadow DOM just fine, but Firefox, Chrome, and extensions that don't support shadow DOM will not work unless the polyfill is added in all other locations. I can look into that.

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 (partially) [Password Managers] Some password manager icons do not show up on input fields #10274
• This PR is related to issue or discussion:
• 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.