perf(extension): Ensure Angular code actions are only retrieved in Angular contexts (#1842)

This change extends the short-circuit logic that has been enabled for
other features to the code actions as well.

Original issue was #1176

New performance issues have been reported recently (#1840), likely due
to the code fixes for auto imports.

(cherry picked from commit 13d165c)

Author: atscott

client/src/client.ts

@@ -60,6 +60,15 @@ export class AngularLanguageClient implements vscode.Disposable {
       revealOutputChannelOn: lsp.RevealOutputChannelOn.Never,
       outputChannel: this.outputChannel,
       middleware: {
+        provideCodeActions: async (
+            document: vscode.TextDocument, range: vscode.Range, context: vscode.CodeActionContext,
+            token: vscode.CancellationToken, next: lsp.ProvideCodeActionsSignature) => {
+          if (await this.isInAngularProject(document) &&
+              isInsideInlineTemplateRegion(document, range.start) &&
+              isInsideInlineTemplateRegion(document, range.end)) {
+            return next(document, range, context, token);
+          }
+        },
         prepareRename: async (
             document: vscode.TextDocument, position: vscode.Position,
             token: vscode.CancellationToken, next: lsp.PrepareRenameSignature) => {