Fix #244138: Match extension Disable/Enable dropdown primary to current scope

[Hude06]

Fixes #244138.

The bug

When an extension is in EnablementState.EnabledWorkspace (disabled globally but enabled for this workspace), the extensions view shows a primary button labelled "Disable" with a dropdown containing both "Disable" and "Disable (Workspace)". Clicking the primary wipes the workspace customization the user just set up. The mirror bug exists for DisabledWorkspace: the primary is "Enable" (global) when it should be "Enable (Workspace)".

Desired behaviour

Current enablement state	Primary button	Dropdown also contains
EnabledGlobally	Disable	Disable (Workspace)
EnabledWorkspace	Disable (Workspace)	Disable
DisabledWorkspace	Enable (Workspace)	Enable
DisabledGlobally	Enable	Enable (Workspace)

Bold rows are the cases this PR fixes. Every state remains reachable from every other state via the dropdown, which was the concern raised on #244419 — see below.

Why the previous attempts were closed

Three prior PRs tried to fix this (#244419, #246500, #251531) and were all closed. The common failure mode was hiding the global action from the dropdown when in a workspace state, which created a state-transition loop: once the user selected a workspace-scoped action, they could never reach the global enable/disable again (sandy081's comment on #244419).

This PR does not hide any actions. It only swaps which action is primary. setEnablement(ext, EnabledGlobally) and setEnablement(ext, DisabledGlobally) already clear workspace overrides in extensionEnablementService.ts, so the global actions in the dropdown continue to function as the loop-breaker.

Implementation

• Add a protected selectPrimaryAction(actions) hook to ButtonWithDropDownExtensionAction. Default returns actions[0] (no behaviour change for any other dropdown subclass).
• In ButtonWithDropDownExtensionAction.update(), reorder so the chosen primary appears first in the menu.
• Override selectPrimaryAction in EnableDropDownAction to prefer EnableForWorkspaceAction when enablementState === DisabledWorkspace.
• Override selectPrimaryAction in DisableDropDownAction to prefer DisableForWorkspaceAction when enablementState === EnabledWorkspace.

The override only triggers when the workspace-scoped child is actually enabled, so it cannot accidentally promote a non-actionable action.

Tests

Four new tests in src/vs/workbench/contrib/extensions/test/electron-browser/extensionsActions.test.ts:

• EnableDropDownAction primary is workspace action when extension is disabled in workspace — asserts label is Enable (Workspace).
• EnableDropDownAction primary is global action when extension is disabled globally — regression test, asserts label is Enable.
• DisableDropDownAction primary is workspace action when extension is enabled in workspace — asserts label is Disable (Workspace).
• DisableDropDownAction primary is global action when extension is enabled globally — regression test, asserts label is Disable.

Verification

• npm run compile-check-ts-native passes with no new errors.
• Existing EnableDropDownAction / DisableDropDownAction tests still pass (the default hook returns actions[0], matching prior behaviour for any state not explicitly handled).

cc @sandy081

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