feat(e2e): e2e setup and cluster onboarding / offboarding test

[abhijith-darshan]

Description

This PR implements an E2E framework to run tests on gh-actions.

• E2E workflow run on PR
• Detect E2E scenarios in e2e folder and run parallely in matrix (Multiple K8s Versions X Scenario)
• Initial version of e2e bootstrap provided in pkg/e2e
• Implements E2E test for Cluster Onboarding / Offboarding

Miscellaneous -

• greenhousectl dev enhanced to wait till manager deployment is ready (Condition Available)

What type of PR is this? (check all applicable)

• 🍕 Feature
• 🐛 Bug Fix
• 📝 Documentation Update
• 🎨 Style
• 🧑‍💻 Code Refactor
• 🔥 Performance Improvements
• ✅ Test
• 🤖 Build
• 🔁 CI
• 📦 Chore (Release)
• ⏩ Revert

Related Tickets & Documents

Related Issues:

• [FEAT] - E2E Workflow #467
• [FEAT] - e2e test for Cluster Bootstrap #291
• [FEAT] - Cluster off-boarding automation #91

Added tests?

• 👍 yes
• 🙅 no, because they aren't needed
• 🙋 no, because I need help
• Separate ticket for tests # (issue/pr)

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

Added to documentation?

• 📜 README.md
• 🤝 Documentation pages updated
• 🙅 no documentation needed
• (if applicable) generated OpenAPI docs for CRD changes

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[kengou]

LGTM

[IvoGoman]

Thanks 💯