Automatically use defaults for github provider

[RayBB]

What problem will this feature address?

It's annoying when creating a new application to have to select the GitHub account and branch when there is already only one option.

Describe the solution you'd like

It would be nice if you automatically loaded the repos from the github that's already connected if there's only one github connected.

Also, once you select a repo it would be nice if it automatically suggests the default branch (or main/master).

Describe alternatives you've considered

It's easy enough to just select them but I thought this would be a relatively simple thing to make the process faster for most people.

Additional context

No response

Will you send a PR to implement it?

Maybe, need help