Add ability to run tests on available Rancher Manager

[cpinjani]

What does this PR do?

• Adds support in framework to run tests on any available Rancher manager
• Changed job summary, as custom run-name was not working on scheduled jobs

Which issue(s) this PR fixes (optional, in fixes #(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):

Fixes #62

Checklist:

• Squashed commits into logical changes
• GitHub Actions

Custom Rancher:
AKS-E2E EKS-E2E GKE-E2E

CI Installed Rancher:
AKS-E2E EKS-E2E GKE-E2E

Special notes for your reviewer:

Since GHA has limitation of max 10 inputs for workflow_dispatch, disabled k3s_version input as a tradeoff and uyse default k3s version. https://github.com/rancher/hosted-providers-e2e/actions/runs/7884132500

[valaparthvi]

I am not sure I like this change. I have been frequently using this input and I find it helpful.

This 10 input limit is always going to be blocker. I see it being one when we add more test suites and need a way to run the tests. Maybe we can use choice input type, anyway that's a future problem.

For now, can you do something like <downstream_version/rancher_version/k3s_version> the same way you did for <hostname/password>? The 3 of them are almost always used together and we can also get rid of 2 extra inputs without compromising.

[cpinjani]

Okay, I'll refactor the inputs

[valaparthvi]

There is one more change that we can introduce in this PR to reduce the input number.
See:

1. 9a917d9
2. GKE 1.27.3-gke.100 on Rancher v2.8-head deployed on v1.27.9+k3s1

This way when we add a new test suite, it will just be another addition to the JSON.

Ref:

1. https://github.com/orgs/community/discussions/8774#discussioncomment-3747116
2. https://docs.github.com/en/actions/learn-github-actions/expressions#fromjson

[cpinjani]

Job runs after refactoring (9cdee16). Ran with different combinations of tests and they got executed as per the user input.
Custom Rancher:
AKS-E2E EKS-E2E GKE-E2E

CI Installed Rancher:
AKS-E2E EKS-E2E GKE-E2E