Show command descriptions as tooltips in Command Palette

[Riya-chandra]

What this PR does

This PR surfaces existing command descriptions as native tooltips in the
Command Palette.

VS Code already stores command metadata (including descriptions) in
CommandsRegistry, but this information was not visible in the UI.
This change exposes that existing data via a simple hover tooltip,
making it easier to explore and understand less familiar commands.

Why this is useful

• Improves discoverability of commands, especially for new users
• Reduces trial-and-error when exploring the Command Palette
• Uses existing metadata only — no new data or behavior introduced
• Minimal, UI-only change with low risk

Implementation details

• Retrieves command metadata via CommandsRegistry.getCommand
• Uses metadata.description when available (with localized string support)
• Applies tooltip at the entry level (title attribute)

Notes

Local build was not run due to environment constraints. This change is
isolated to the Quick Input UI layer.

Fixes #260868
@TylerLeonhardt...Please look into this

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[TylerLeonhardt]

There is a lot of code style changes in this PR, some of which go against our style guides.

Can you please revert all the styling changes and only include the actual functional change