feat(synthetics): graduate to stable 🚀 (#27305)

We are excited to graduate the `@aws-cdk/aws-synthetics-alpha` module to STABLE. It now lives on as `aws-cdk-lib/aws-synthetics`. 

**Deprecated properties removed**:

- Runtimes before `SYNTHETICS_NODEJS_PUPPETEER_3_5` have been removed from the stable module. Use a later version instead.
- `enableAutoDeleteLambdas` has been removed from the stable module. Use `cleanup: Cleanup.LAMBDA` instead, which achieves the same affect via custom resource.

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

Author: kaizencc

packages/@aws-cdk-testing/framework-integ/.gitignore

@@ -9,6 +9,9 @@ junit.xml
 coverage
 nyc.config.js
 
+!test/aws-synthetics/test/canaries/**/*
+
+
 !**/*.snapshot/**/asset.*/*.js
 !**/*.snapshot/**/asset.*/*.d.ts