actions: add WorkbenchActionBar with telemetry support

[jrieken]

Summary

Add a WorkbenchActionBar class that wraps ActionBar with automatic workbenchActionExecuted telemetry, analogous to how WorkbenchToolBar wraps ToolBar. Adopt it in the inline chat overlay widget.

Fixes #306432

Session Context

Key decisions from the development session:

• New class instead of modifying ActionBar: Created a new WorkbenchActionBar in src/vs/platform/actions/browser/actionbar.ts rather than modifying the base ActionBar class, following the existing pattern of WorkbenchToolBar (wraps ToolBar) and WorkbenchButtonBar (wraps ButtonBar).
• Separate file: Placed in its own file actionbar.ts alongside toolbar.ts and buttonbar.ts, consistent with the existing per-widget file organization.
• Incremental adoption: Only the inline chat overlay widget's action bar is migrated in this PR. Other ActionBar usages can adopt WorkbenchActionBar separately.

Changes

• New file src/vs/platform/actions/browser/actionbar.ts: WorkbenchActionBar extends ActionBar, injects ITelemetryService, and subscribes to onDidRun to log workbenchActionExecuted when telemetrySource is set.
• src/vs/workbench/contrib/inlineChat/browser/inlineChatOverlayWidget.ts: Replaced new ActionBar(...) with instantiationService.createInstance(WorkbenchActionBar, ...) and added telemetrySource: 'inlineChatInput.actionBar'.

[github-actions]

Screenshot Changes

Base: 77387b38 Current: 33955465

Changed (2)

editor/inlineCompletions/SideBySideView/Light

Before	After

editor/suggestWidget/MethodCompletions/Dark

Before	After

[Copilot]

Pull request overview

Adds a new WorkbenchActionBar wrapper to automatically emit workbenchActionExecuted telemetry for ActionBar-based UI, and adopts it in the inline chat overlay action bar to capture action execution entry points (Fixes #306432).

Changes:

• Added WorkbenchActionBar (extends ActionBar) that logs workbenchActionExecuted when telemetrySource is provided.
• Updated inline chat overlay widget to instantiate WorkbenchActionBar and set telemetrySource: 'inlineChatInput.actionBar'.

Show a summary per file

File	Description
src/vs/platform/actions/browser/actionbar.ts	Introduces WorkbenchActionBar with opt-in workbenchActionExecuted telemetry logging.
src/vs/workbench/contrib/inlineChat/browser/inlineChatOverlayWidget.ts	Switches the inline chat gutter action bar to WorkbenchActionBar and sets a telemetry source.

Copilot's findings

• Files reviewed: 2/2 changed files
• Comments generated: 1