Remove deprecated configuration options

[MichaReiser]

Remove configuration options that are marked as deprecated.

[tibor-reiss]

Looks like a nice place to start contributing to this super tool!

[MichaReiser]

As of today:

• show-source
• tab-size
• Top level lint settings
• extend-ignore
• extend-unfixable
• ignore-init-module-imports

[MichaReiser]

ignore-init-module-imports

This option has only been deprecated with Ruff 0.4.4 (#11436) and the new behavior is still gated behind preview (we may want to promote it to stable?). I think we should wait with removing the option until after the new F401 behavior has been stabilized

[MichaReiser]

There's also the output-format text that is deprecated and that we probably should remove