WIP: chore: add ci script for e2e testing

[salasberryfin]

What this PR does / why we need it:

Based on the configuration used in upstream projects, e.g. CAPA, and setting up E2E tests running periodically in Prow as a PoC (which hopefully solves the current stability of nightly tests and can be promoted to full-time solution), this PR adds a script used to trigger the full E2E test suite.

In the future, if required, this script can include the logic to interact with boskos and run the janitors.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:

Checklist:

• squashed commits into logical changes
• includes documentation
• adds unit tests
• adds or updates e2e tests

[richardcase]

@salasberryfin - what else do we need from this to move it from wip? Guessing we need to update the GHA workflow to call the script?

[salasberryfin]

I was thinking about re-using these scripts as a base for adding the AWS environment to run Rancher Manager but only did some tests with eksctl last week. I'll try to find some time to look at it this week and we can use a single PR with all the changes, if that's the decision we go for. Does that sound good? If so, we can maybe close this and work in a separate PR.

[richardcase]

Yeah happy to close this and pick it up as part of #382