Replace ECS test with private released private image (#276)

*Description of changes:*
Replace ECS test with private released private image

*Rollback procedure:*
revert this commit

*Ensure you've run the following tests on your changes and include the
link below:*

To do so, create a `test.yml` file with `name: Test` and workflow
description to test your changes, then remove the file for your PR. Link
your test run in your PR description. This process is a short term
solution while we work on creating a staging environment for testing.

NOTE: TESTS RUNNING ON A SINGLE EKS CLUSTER CANNOT BE RUN IN PARALLEL.
See the
[needs](https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idneeds)
keyword to run tests in succession.
- Run Java EKS on `e2e-playground` in us-east-1 and eu-central-2
- Run Python EKS on `e2e-playground` in us-east-1 and eu-central-2
- Run metric limiter on EKS cluster `e2e-playground` in us-east-1 and
eu-central-2
- Run EC2 tests in all regions
- Run K8s on a separate K8s cluster (check IAD test account for master
node endpoints; these will change as we create and destroy clusters for
OS patching)

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

Author: zzhlogin

.github/workflows/java-ecs-test.yml

@@ -133,7 +133,7 @@ jobs:
             echo CWAGENT_IMAGE_URI="${{ secrets.AWS_ECR_PRIVATE_REGISTRY }}/cwagent-integration-test:${{ github.sha }}" >> $GITHUB_ENV
           else
             # echo CWAGENT_IMAGE_URI="public.ecr.aws/cloudwatch-agent/cloudwatch-agent:latest" >> $GITHUB_ENV
-            echo CWAGENT_IMAGE_URI="public.ecr.aws/y8s3a7r9/cloudwatch-agent:latest" >> $GITHUB_ENV
+            echo CWAGENT_IMAGE_URI="136146983976.dkr.ecr.us-east-1.amazonaws.com/cloudwatch-agent:1.300047.0b872" >> $GITHUB_ENV
           fi
 
       - name: Deploy sample app via terraform and wait for the endpoint to come online

.github/workflows/python-ecs-test.yml

@@ -133,7 +133,7 @@ jobs:
             echo CWAGENT_IMAGE_URI="${{ secrets.AWS_ECR_PRIVATE_REGISTRY }}/cwagent-integration-test:${{ github.sha }}" >> $GITHUB_ENV
           else
             # echo CWAGENT_IMAGE_URI="public.ecr.aws/cloudwatch-agent/cloudwatch-agent:latest" >> $GITHUB_ENV
-            echo CWAGENT_IMAGE_URI="public.ecr.aws/y8s3a7r9/cloudwatch-agent:latest" >> $GITHUB_ENV
+            echo CWAGENT_IMAGE_URI="136146983976.dkr.ecr.us-east-1.amazonaws.com/cloudwatch-agent:1.300047.0b872" >> $GITHUB_ENV
           fi
 
       - name: Deploy sample app via terraform and wait for the endpoint to come online