types(interactions): fix {Slash,ContextMenu}CommandBuilder#toJSON

[kyranet]

Please describe the changes this PR makes and why it should be merged:

SlashCommandBuilder and ContextMenuCommandBuilder's toJSON methods returned the base interface (RESTPostAPIApplicationCommandsJSONBody) rather than the specific interfaces they build (RESTPostAPIChatInputApplicationCommandsJSONBody and RESTPostAPIContextMenuApplicationCommandsJSONBody respectively).

Status and versioning classification:

• Code changes have been tested against the Discord API, or there are no code changes
• I know how to update typings and have done so, or typings don't need updating
• This PR only includes non-code changes, like changes to documentation, README, etc.

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1 Ignored Deployment

Name	Status	Preview	Updated
discord-js	⬜️ Ignored (Inspect)		Sep 2, 2022 at 3:24PM (UTC)

[codecov]

Codecov Report

Merging #8568 (2f9795c) into main (3b7ba40) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #8568      +/-   ##
==========================================
+ Coverage   86.35%   86.37%   +0.02%     
==========================================
  Files          86       87       +1     
  Lines        8598     8611      +13     
  Branches     1102     1107       +5     
==========================================
+ Hits         7425     7438      +13     
  Misses       1131     1131              
  Partials       42       42              

Flag	Coverage Δ
builders	100.00% <100.00%> (ø)
collection	100.00% <ø> (ø)
proxy	74.10% <ø> (ø)
rest	92.00% <ø> (ø)
utilities	100.00% <ø> (?)
voice	63.86% <ø> (ø)
ws	60.46% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...s/contextMenuCommands/ContextMenuCommandBuilder.ts	100.00% <100.00%> (ø)
.../interactions/slashCommands/SlashCommandBuilder.ts	100.00% <100.00%> (ø)
packages/actions/src/formatTag/formatTag.ts	100.00% <0.00%> (ø)

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