Show loading spinner when waiting for backups (re)load

[jpbede]

Proposed change

Show a loading spinner while waiting for backups to load. Especially when using network shares, loading backups can take a few seconds. The data table would then display “You don't have any backups yet.”, even though there are backups.

Instead, a loading spinner is now displayed to show that the backups are being loaded.

Also refreshData has been removed, it only calls fetchBackups with an additional reloadHassioBackups (which is also called in fetchBackups, so it is called twice)

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 No loading indicator for backups #20334
• 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

[uberchris2]

Thank you @jpbede !