The F3+T shortcut to reload resources does not work in the main menus

Pressing F3+T to reload resources in the main menu isn't possible, which poses a challenge when editing an enabled resource pack. Each major or minor change requires a resource reload for the adjustments to take effect, meaning that without the F3+T shortcut, the workaround involves either disabling and then re-enabling the resource pack, or entering a world and then using the shortcut. Both are tedious, and unnecessary.

Steps to Reproduce:

1. Enable a resource pack (if you do not have any, a 'dummy' pack is provided)
   DummyPack.zip
2. Enter the game's homescreen
3. Press F3 + T to reload assets

Expected & Observed Results:

- The hotkey does nothing, and no assets are reloaded
- The hotkey would properly reload all of the games assets

Notes:

Related to MC-264307 MC-269123