extension/test/integration: disable local dlv install tests

For go1.19 and go1.20, the extension tries to install a pinned version
of dlv (the last version that is compatible with the old go version).
The local proxy used for testing does not have the pinned version
so the test fails. Ironically this test failure indicates the dlv install
logic works as expected. Since the fix is non-trivial and hard to be
done before v0.42.0 release, skip them in go1.19/go1.20 CI.

For #3454

Change-Id: Iccd9d905ab46adf255c52d82817046d4fb85fe81
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/598196
Commit-Queue: Hyang-Ah Hana Kim <[email protected]>
Reviewed-by: Hongxiang Jiang <[email protected]>
kokoro-CI: kokoro <[email protected]>

extension/test/integration/install.test.ts

@@ -189,7 +189,12 @@ suite('Installation Tests', function () {
 		);
 	});
 
-	test('Install multiple tools with a local proxy', async () => {
+	test('Install multiple tools with a local proxy', async function () {
+		// TODO(golang/vscode-go#3454): reenable the test for old go.
+		const systemGoVersion = await getGoVersion();
+		if (systemGoVersion.lt('1.21')) {
+			this.skip();
+		}
 		await runTest(
 			[
 				{ name: 'gopls', versions: ['v0.1.0', 'v1.0.0-pre.1', 'v1.0.0'], wantVersion: 'v1.0.0' },
@@ -199,7 +204,12 @@ suite('Installation Tests', function () {
 		);
 	});
 
-	test('Install multiple tools with a local proxy & GOBIN', async () => {
+	test('Install multiple tools with a local proxy & GOBIN', async function () {
+		// TODO(golang/vscode-go#3454): reenable the test for old go.
+		const systemGoVersion = await getGoVersion();
+		if (systemGoVersion.lt('1.21')) {
+			this.skip();
+		}
 		await runTest(
 			[
 				{ name: 'gopls', versions: ['v0.1.0', 'v1.0.0-pre.1', 'v1.0.0'], wantVersion: 'v1.0.0' },