Add option to pass in openj9 systemtest repo and branch

[sophia-guo]

Currently we are using the default eclipse-openj9/openj9-systemtest to run against openj9 java implementation. It would be nice to add eclipse-openj9/openj9-systemtest repo and branch as options. So run-aqa action can also be used as the part of eclipse-openj9/openj9-systemtest developer's PR tests.

[somya-15]

Can I (Somya-15) and Nandini(nandini-4120) be assigned this issue. We are willing to collaborate on this issue.

[smlambert]

I can assign you if you make a comment in the issue, @Nandini-4120

[smlambert]

Note the solution to this will be similar to PR #102 and PR #103

[Nandini-4120]

Can I Nandini(nandini-4120) be assigned this issue? Somya and me are willing to collaborate on this issue.

[somya-15]

Hi, I(somya-15) and Nandini(Nandini-4120) collaborated on this single issue. Kindly consider us as contributors for the PR.
Should both of us fill the ECA agreement?

[smlambert]

Yes, both need the ECA agreement signed, and the PR should use the "Co-authored-by" keyword so that both authors get credited for the change.

(related doc: https://docs.github.com/en/github/committing-changes-to-your-project/creating-and-editing-commits/creating-a-commit-with-multiple-authors#creating-co-authored-commits-on-the-command-line)

[somya-15]

Kindly suggest changes/corrections that we can make in the PR as we are unable to pass 3 tests as shown below:

[smlambert]

related: #107