Use default options in all e2e tests

[pablochacin]

Description

In order to facilitate reusing the test cluster use default options in all e2e tests.

Checklist:

• 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
• I have added tests that prove my fix is effective or that my feature works.
• I have run linter locally (make lint) and all checks pass.
• I have run tests locally (make test) and all tests pass.
• I have run relevant e2e test locally (make e2e-xxx for agent, disruptors, kubernetes or cluster related changes)
• Any dependent changes have been merged and published in downstream modules
  

[roobre]

I'm not sure I understand how the tooling is intended to be used after this change.

If I'm reading this correctly:

• Different E2E tests now use the same cluster name and run in parallel
• E2E tests still have reuse: false and cleanup: true by default

Wouldn't this cause issues if tests are (accidentally or not) started without E2E_REUSE=1?
If this is the case, shouldn't E2E_REUSE become the default behavior?

[pablochacin]

Wouldn't this cause issues if tests are (accidentally or not) started without E2E_REUSE=1?
If this is the case, shouldn't E2E_REUSE become the default behavior?

The idea is that reusing should not be the default when running each test independently but when running a series of tests to speed up the process.

I think the actual behavior and options are the more sensible choice to cover these two use scenarios.