Add time option for backup schedule

[bramkragten]

Proposed change

• remove aktivate toggle and use never schedule instead

• add custom schedule days

• add custom time option

• improve styling

• reduce code duplication

• add tip to create automation for backups

• Add new translations for next backup and summary of settings

• core PR: Make the time for automated backups configurable core#135825

• core PR: Add support for custom weekly backup schedule core#136079

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 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.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io