fix(commands): run parent command's after_invoke before invoking children

[shiftinv]

Summary

Fixes #893, supersedes #1192.

The issue in #893 is actually a side-effect of another bug - a parent slash command's after_invoke currently runs after the hooks and invokes of the group/sub command. This is unlike prefix commands, which are all self-contained before -> invoke -> after sets for each group/command in the chain.
Running the parent slash command's after_invoke late then also meant that Interaction.application_command was set to the subcommand, as its .prepare() had already run.

I've marked this as a breaking change just to be on the safe side, though it shouldn't have a significant impact.

To maybe illustrate ths a bit better, consider a root command, with a group sub command group, which has a sub sub command -

# before
root.before_invoke()
root.invoke()
  group.before_invoke()
  group.invoke()
  group.after_invoke()
    sub.before_invoke()
    sub.invoke()
    sub.after_invoke()
root.after_invoke()

# after (also matching prefix cmd behavior)
root.before_invoke()
root.invoke()
root.after_invoke()
  group.before_invoke()
  group.invoke()
  group.after_invoke()
    sub.before_invoke()
    sub.invoke()
    sub.after_invoke()

Checklist

• If code changes were made, then they have been tested
  • I have updated the documentation to reflect the changes
  • I have formatted the code properly by running uv run nox -s lint
  • I have type-checked the code by running uv run nox -s pyright
• This PR fixes an issue
• This PR adds something new (e.g. new method or parameters)
• This PR is a breaking change (e.g. methods or parameters removed/renamed)
• This PR is not a code change (e.g. documentation, README, ...)

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