src/goMain: stop trying to diagnose when gopls is not running

Since v0.40.0, the extension does not need to attempt to produce
diagnostics when gopls is not running. Delete the code that
triggers the legacy check during activation.

Change-Id: Iff507421e073b2e30c1e0959a5db280f82e20224
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/545916
TryBot-Result: kokoro <[email protected]>
Commit-Queue: Hyang-Ah Hana Kim <[email protected]>
Reviewed-by: Suzy Mueller <[email protected]>

Author: hyangah

src/goMain.ts

@@ -109,15 +109,6 @@ export async function activate(ctx: vscode.ExtensionContext): Promise<ExtensionA
 	initCoverageDecorators(ctx);
 
 	registerCommand('go.builds.run', commands.runBuilds);
-
-	const activeDoc = vscode.window.activeTextEditor?.document;
-	if (!goCtx.languageServerIsRunning && activeDoc?.languageId === 'go' && isGoPathSet()) {
-		// Check mod status so that cache is updated and then run build/lint/vet
-		isModSupported(activeDoc.uri).then(() => {
-			vscode.commands.executeCommand('go.builds.run', activeDoc, getGoConfig(activeDoc.uri));
-		});
-	}
-
 	registerCommand('go.environment.status', expandGoStatusBar);
 
 	GoRunTestCodeLensProvider.activate(ctx, goCtx);