Fix Extensions view showing redundant Disable dropdown for workspace-enabled extensions

[Alexoswin]

Summary

Fixes #244138.

When an extension is disabled globally and then explicitly re-enabled for the current workspace only, its enablementState becomes EnablementState.EnabledWorkspace. DisableGloballyAction.update() treated that state the same as EnablementState.EnabledGlobally, so the "Disable" (global) action stayed enabled and visible alongside "Disable (Workspace)" — producing a dropdown with both options even though the extension isn't actually enabled globally in this state.

This change restricts DisableGloballyAction to only be enabled when the extension's enablementState is EnabledGlobally, so in the workspace-override case the Extensions view shows a single "Disable (Workspace)" button with no dropdown, matching the expected behavior described in the issue.

Test plan

• Install an extension and disable it globally.
• Enable the extension for the current workspace only.
• In the Extensions view, confirm the action button reads "Disable (Workspace)" with no dropdown arrow/menu.
• Confirm a normally (globally) enabled extension still shows the "Disable" dropdown with both "Disable" and "Disable (Workspace)" options, unchanged from before.

[Copilot]

Pull request overview

Fixes an Extensions view UI bug where an extension that is disabled globally but re-enabled for the current workspace would still offer the global Disable action, resulting in a redundant dropdown containing both Disable and Disable (Workspace).

Changes:

• Updates DisableGloballyAction.update() to enable/offer the global disable action only when enablementState === EnablementState.EnabledGlobally.
• Prevents the global disable action from being shown in the workspace-override (EnabledWorkspace) case, so the UI presents only Disable (Workspace) without a dropdown.

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