add new job to run internal encryption tests for Contour

[KauzClay]

What this PR does, why we need it:

• run test added in Add setup script for internal-encryption e2e test serving#13559 on each PR
• test does nothing now, will be implemented in a later PR (Implement e2e test for internal encryption serving#13536)
• Part of a series of PRs to add an e2e test for Internal Encryption feature
• In support of implementing internal encryption for net-contour here: net-contour supports internal encryption configuration knative-extensions/net-contour#819.

[knative-prow]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[krsna-m]

@KauzClay Looks like update-codegen script needs to be ran. The prow job_config yaml is just a template the codegen tool will generate the actual job yaml

[krsna-m]

/approve

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: KauzClay, kvmware

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[krsna-m]

/lgtm

[knative-prow]

@KauzClay: Updated the job-config configmap in namespace default at cluster default using the following files:

• key serving-main.gen.yaml using file prow/jobs/generated/knative/serving-main.gen.yaml

In response to this:

What this PR does, why we need it:

• run test added in Add setup script for internal-encryption e2e test serving#13559 on each PR
• test does nothing now, will be implemented in a later PR (Implement e2e test for internal encryption serving#13536)
• Part of a series of PRs to add an e2e test for Internal Encryption feature
• In support of implementing internal encryption for net-contour here: net-contour supports internal encryption configuration knative-extensions/net-contour#819.

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