fix: run only local hooks for SlashCommandGroup

[OmLanke]

Summary

Fixes bot and cog before_invoke hooks being called twice for subcommands (once with ctx.command set to the group, and once with ctx.command set to the subcommand). Fixes #2134 as discussed in the discord server.

This bug originally arised due to #2091 cleaning up the prepare logic. I personally would have considered a feature rather than a bug.

Information

• 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, typehinting,
  examples, ...).

Checklist

• I have searched the open pull requests for duplicates.
• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• If type: ignore comments were used, a comment is also left explaining why.
• I have updated the changelog to include these changes.

[codecov]

Codecov Report

Merging #2139 (97b6641) into master (27d7782) will decrease coverage by 0.02%.
The diff coverage is 14.28%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2139      +/-   ##
==========================================
- Coverage   33.87%   33.86%   -0.02%     
==========================================
  Files         109      109              
  Lines       22353    22367      +14     
==========================================
+ Hits         7573     7575       +2     
- Misses      14780    14792      +12     

Flag	Coverage Δ
macos-latest-3.10	33.84% <14.28%> (-0.02%)	⬇️
macos-latest-3.11	33.84% <14.28%> (-0.02%)	⬇️
macos-latest-3.8	33.85% <14.28%> (-0.02%)	⬇️
macos-latest-3.9	33.85% <14.28%> (-0.02%)	⬇️
ubuntu-latest-3.10	33.84% <14.28%> (-0.02%)	⬇️
ubuntu-latest-3.11	33.84% <14.28%> (-0.02%)	⬇️
ubuntu-latest-3.8	33.85% <14.28%> (-0.02%)	⬇️
ubuntu-latest-3.9	33.85% <14.28%> (-0.02%)	⬇️
windows-latest-3.10	33.84% <14.28%> (-0.02%)	⬇️
windows-latest-3.11	33.84% <14.28%> (-0.02%)	⬇️
windows-latest-3.8	33.85% <14.28%> (-0.02%)	⬇️
windows-latest-3.9	33.85% <14.28%> (-0.02%)	⬇️

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Impacted Files	Coverage Δ
discord/commands/core.py	40.30% <14.28%> (-0.44%)	⬇️

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[Lulalaby]

Changelog

[JustaSqu1d]

type: ignore comments were used but lacked additional rationale (unless I am missing something).

[OmLanke]

type: ignore comments were used but lacked additional rationale (unless I am missing something).

I just copy pasted the methods from ApplicationCommand and removed the Cog and Bot scoped hooks. The type: ignore comments were used there too. Idk why they are used

[Lulalaby]

then we keep it like that