Fix tab focus issue in entity picker and password form.

[maykar]

Proposed change

This sets the tab-index of button elements inside paper-inputs to -1. This fixes the issue of the tab key not moving on to the next element as it should. Since you can press down to show entities and delete the contents via keyboard it would be unnecessary to be able to tab to those button elements for accessibility. This also sets tab-index="-1" for the password field's unmask button to fix the same issue on login form.

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 paper-input followed by ha-icon-button prevent tab from moving focus forward #7206
• This PR fixes or closes issue: fixes User is unable to tab past password field to select other login options like Trusted Networks #4689
• 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