Migrate to consolidated e2e test suite

[mamy-CS]

Summary

Consolidated e2e test suite (test/e2e/) infrastructure

• All tests use an environment-agnostic consolidated suite
• Added test fixtures and builders
• Added test configuration system
• Added better error handling and diagnostics throughout test suite
• Updated to run test-e2e-smoke-with-setup automatically on PRs with code changes
• Added deprecation notes to test-e2e and test-e2e-openshift Makefile targets
• Old targets remain functional for backward compatibility during migration, and will be removed after full verification
• Some tests are labeled flaky/ skipped (currently being worked on by other folks)
• More prs coming to update/ add/ remove e2es as needed, this pr is focused on e2e infrastructure