Revert "src/goInstallTools: show error if go.languageserver.restart fails"

This reverts commit b012df4.

We are still getting errors like
 "rejected promise not handled within 1 second: Error: command
'go.languageserver.restart' not found"
after this change.

It doesn't fail the tests, but pollutes test output.

Looking for a better approach.

Change-Id: I93bee844ca01f5d0a533f2059eefd00ea127e971
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/418776
TryBot-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Jamal Carvalho <jamal@golang.org>
Run-TryBot: Hyang-Ah Hana Kim <hyangah@gmail.com>

Author: hyangah

src/goInstallTools.ts

@@ -191,11 +191,7 @@ export async function installTools(
 			failures.push({ tool, reason: failed });
 		} else if (tool.name === 'gopls') {
 			// Restart the language server if a new binary has been installed.
-			try {
-				vscode.commands.executeCommand('go.languageserver.restart', RestartReason.INSTALLATION);
-			} catch (e) {
-				vscode.window.showErrorMessage(`Failed to start language server: ${e}`);
-			}
+			vscode.commands.executeCommand('go.languageserver.restart', RestartReason.INSTALLATION);
 		}
 	}