fix: support keybinding invocation for git reveal commands

[yogeshwaran-c]

What kind of change does this PR introduce?

Bug fix

What is the current behavior?

The git.revealFileInOS.* commands (Open Containing Folder / Reveal in Finder / Reveal in File Explorer) and git.revealInExplorer silently do nothing when invoked via a keybinding. This is because both commands expect a SourceControlResourceState argument that is only provided when invoked from a context menu. When invoked via a keybinding, no argument is passed, so the function hits the early return at if (!resourceState) { return; }.

Closes #260898

What is the new behavior?

When no resourceState argument is provided (keybinding invocation), both commands now fall back to:

1. this.getSCMResource() — resolves the SCM resource for the active editor's document
2. window.activeTextEditor?.document.uri — uses the active editor's URI directly

This matches the existing pattern used by openFile (line 1259-1261) and ignore (line 4411-4412) commands in the same file, which already handle keybinding invocation gracefully.

Additional context

The fix is minimal and follows established conventions in the codebase. Both revealInExplorer and revealFileInOS now work identically whether invoked from a context menu or a keybinding.

Before: Keybinding for "Git: Open Containing Folder" does nothing
After: Keybinding reveals the active file's containing folder in the OS file manager

[vs-code-engineering]

📬 CODENOTIFY

The following users are being notified based on files changed in this PR:

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Matched files:

• extensions/git/src/commands.ts

[yogeshwaran-c]

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