Configure SSH Keep Alive

[musa-asad]

Description of the issue

Some of our metric_value_benchmark tests for EC2Linux fail since the test takes too long to run.

│ Error: remote-exec provisioner error
│ 
│   with null_resource.integration_test_run,
│   on main.tf line 86, in resource "null_resource" "integration_test_run":
│   86:   provisioner "remote-exec" {
│ 
│ error executing "/tmp/terraform_XXXXXXXXXX.sh": wait: remote command exited
│ without exit status or exit signal

Description of changes

• Add Configure SSH Keep Alive step for EC2 to send a keep-alive signal for all SSH hosts.

License

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

Tests

Ran workflow: https://github.com/aws/amazon-cloudwatch-agent/actions/runs/12176145545.

Requirements

Before commit the code, please do the following steps.

1. Run make fmt and make fmt-sh
2. Run make lint

[musa-asad]

Will change after testing.

Suggested change

	CWA_GITHUB_TEST_REPO_BRANCH: "ssh-keep-alive"
	CWA_GITHUB_TEST_REPO_BRANCH: "main"

[github-actions]

This PR was marked stale due to lack of activity.