chore(cli-integ): ensure bootstrap on cli-lib tests (#33065)

The fixture wasn't ensuring a bootstrapped environment

### Checklist
- [x] My code adheres to the [CONTRIBUTING GUIDE](https://github.com/aws/aws-cdk/blob/main/CONTRIBUTING.md) and [DESIGN GUIDELINES](https://github.com/aws/aws-cdk/blob/main/docs/DESIGN_GUIDELINES.md)

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: iliapolo

packages/@aws-cdk-testing/cli-integ/lib/with-cdk-app.ts

@@ -634,7 +634,7 @@ export class TestFixture extends ShellHelper {
  * Since we go striping across regions, it's going to suck doing this
  * by hand so let's just mass-automate it.
  */
-async function ensureBootstrapped(fixture: TestFixture) {
+export async function ensureBootstrapped(fixture: TestFixture) {
   // Always use the modern bootstrap stack, otherwise we may get the error
   // "refusing to downgrade from version 7 to version 0" when bootstrapping with default
   // settings using a v1 CLI.

packages/@aws-cdk-testing/cli-integ/lib/with-cli-lib.ts

@@ -3,13 +3,14 @@ import * as path from 'path';
 import { TestContext } from './integ-test';
 import { RESOURCES_DIR } from './resources';
 import { AwsContext, withAws } from './with-aws';
-import { cloneDirectory, installNpmPackages, TestFixture, DEFAULT_TEST_TIMEOUT_S, CdkCliOptions } from './with-cdk-app';
+import { cloneDirectory, installNpmPackages, TestFixture, DEFAULT_TEST_TIMEOUT_S, CdkCliOptions, DisableBootstrapContext, ensureBootstrapped } from './with-cdk-app';
 import { withTimeout } from './with-timeout';
 
 /**
  * Higher order function to execute a block with a CliLib Integration CDK app fixture
  */
-export function withCliLibIntegrationCdkApp<A extends TestContext & AwsContext>(block: (context: CliLibIntegrationTestFixture) => Promise<void>) {
+export function withCliLibIntegrationCdkApp<A extends TestContext & AwsContext & DisableBootstrapContext>(
+  block: (context: CliLibIntegrationTestFixture) => Promise<void>) {
   return async (context: A) => {
     const randy = context.randomString;
     const stackNamePrefix = `cdktest-${randy}`;
@@ -44,6 +45,10 @@ export function withCliLibIntegrationCdkApp<A extends TestContext & AwsContext>(
         'constructs': '^10',
       });
 
+      if (!context.disableBootstrap) {
+        await ensureBootstrapped(fixture);
+      }
+
       await block(fixture);
     } catch (e: any) {
       // We survive certain cases involving gopkg.in
@@ -132,3 +137,4 @@ __EOS__`], {
   }
 
 }
+