ci(integ-test-deployment): use integ runner with strict flag (#35974)

### Reason for this change
Previously `integration-test-deployment` was passing in silent if some of the test were not found. 
We want to make sure that all the changed integ tests in a PR ran, or workflow should fail.

### Change
`integration-test-deployment` to use `integ-runner` with `--strict` flag so that workflow fails in case of test not found.


### Testing
Test run on fork: https://github.com/Abogical/aws-cdk/actions/runs/19229944532/job/54965890882?pr=19
### 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: abidhasan-aws

tools/@aws-cdk/integration-test-deployment/lib/integration-test-runner.ts

@@ -90,7 +90,7 @@ export const bootstrap = async (env: NodeJS.ProcessEnv) => {
 export const deployIntegrationTest = async (env: NodeJS.ProcessEnv, snapshotPaths: string[]) => {
   console.log(`Deploying snapshots:\n${snapshotPaths.join('\n')}`);
 
-  const spawnProcess = spawn('yarn', ['integ-runner', '--disable-update-workflow', '--directory', 'packages', '--force', ...snapshotPaths], {
+  const spawnProcess = spawn('yarn', ['integ-runner', '--disable-update-workflow', '--strict', '--directory', 'packages', '--force', ...snapshotPaths], {
     stdio: ['ignore', 'inherit', 'inherit'],
     env,
   });