Fix: consolidate multiple kserve test workflows into a single job

[madmecodes]

Pull Request Template for Kubeflow Manifests

✏️ Summary of Changes

Fixes the improper merge of 3 KServe test workflows by consolidating them into a single job that installs the stack once and runs all tests sequentially.

📦 Dependencies

none

🐛 Related Issues

none

✅ Contributor Checklist

• I have tested these changes with kustomize. See Installation Prerequisites.
• All commits are signed-off to satisfy the DCO check.
• I have considered adding my company to the adopters page to support Kubeflow and help the community, since I expect help from the community for my issue (see 1. and 2.).

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[madmecodes]

shall i also merge all the 3 tests file:

• kserve_test.sh
• knative_authentication_test.sh
• kserve_jwt_authentication_test.sh

[juliusvonkohout]

shall i also merge all the 3 tests file:

* kserve_test.sh

* knative_authentication_test.sh

* kserve_jwt_authentication_test.sh

Yes please, simple and minimalistic.

[juliusvonkohout]

maybe @kunal-511 can help here as well and review.

[juliusvonkohout]

Thank you very much

/lgtm
/approve

[google-oss-prow]

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