Add first e2e test

[tmscarla]

Description

Following https://github.com/aws-samples/pcluster-manager/pull/387 and https://github.com/aws-samples/pcluster-manager/pull/398, this PR introduces the first e2e test in ParallelCluster Manager. The test performs the following steps:

1. Log into the portal using e2e test account
2. Click on Create Cluster button
3. Navigate through the wizard leaving all default options (selecting first VPC only)
4. Perform a dry-run and check that it doesn't fail

Future improvements:

• Retrieve demo environment public URL through Cloudformation
• Leverage Playwright signed in state to isolate the login phase. In this way we can log in only once and then skip the log in step for all of the subsequent tests.

Changelog entry

• Added first e2e test

How Has This Been Tested?

• Manually triggered e2e workflow on ŧsscarla/e2e branch

References

• https://playwright.dev/

PR Quality Checklist

• [x] I added tests to new or existing code
• [ ] I removed hardcoded strings and used our i18n solution instead (see here)
• [ ] I made sure no sensitive info gets logged at any time in the codebase (see here) (e.g. no user info or details, no stacktraces, etc.)
• [ ] I checked that infrastructure/update_infrastructure.sh runs without any error
• [ ] I checked that npm run build builds without any error
• [ ] I checked that clusters are listed correctly
• [ ] I checked that a new cluster can be created (config is produced and dry run passes)
• [ ] I checked that login and logout work as expected

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