Update a few more codebase/workspace strings

[mjbvz]

We should always mention that these are semantic indexes

[Copilot]

Pull request overview

Updates user-facing strings related to workspace/codebase indexing so the UI more clearly describes the indexing feature (intended to be communicated as semantic indexes).

Changes:

• Updated the build-index progress/warning messages in the workspace chunk search command.
• Updated command titles in package.nls.json to include “Semantic Codebase Index” terminology.

Show a summary per file

File	Description
src/extension/workspaceChunkSearch/vscode-node/commands.ts	Adjusts progress and warning strings shown while triggering remote workspace indexing.
package.nls.json	Renames command titles to reference “Semantic Codebase Index”.

Copilot's findings

Comments suppressed due to low confidence (1)

src/extension/workspaceChunkSearch/vscode-node/commands.ts:38

• The warning message uses “remote workspace index” and includes a trailing space before the concatenation. Given the command label is “Build Semantic Codebase Index”, it would be clearer to use the same “semantic codebase index” phrasing here and drop the extra trailing space to avoid odd formatting in the notification.

			if (triggerResult.isError()) {
				if (triggerResult.err.id !== TriggerRemoteIndexingError.alreadyIndexed.id) {
					vscode.window.showWarningMessage(t`Could not build remote workspace index. ` + '\n\n' + triggerResult.err.userMessage);
					return;

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

[mjbvz]

Sorry I realized I messed up the merge with some of these strings. Need a re-review