BUILD-960: Update Containers to UBI9 go-toolset

[adambkaplan]

• Update Dockerfiles to use the ubi9 go-toolset images. For the releaser image, this avoids downloading the go sdk as part of the relase process.
• Add build-container make target for convenience.
• Update ci-operator build root to use rhel-9 golang 1.20 image for OCP 4.15

[openshift-ci-robot]

@adambkaplan: This pull request references BUILD-960 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the story to target the "4.16.0" version, but no target version was set.

In response to this:

• Update Dockerfiles to use the ubi9 go-toolset images. For the releaser image, this avoids downloading the go sdk as part of the relase process.
• Add build-container make target for convenience.
• Update ci-operator build root to use rhel-9 golang 1.20 image for OCP 4.15

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[openshift-ci]

@adambkaplan: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/security	349a4d9	link	false	/test security

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[adambkaplan]

/assign @ayushsatyam146

We discussed building s2i with Konflux earlier today. I had previously started onboarding, but ran into an issue pulling the base images in this Dockerfile (which reference the OpenShift CI registry). This updates the Dockerfiles to use UBI images, which can be pulled from the Red Hat container catalog. The only limitation is creating a Red Hat account, which anyone can do using the Developer subscription.

[ayushsatyam146]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: adambkaplan, ayushsatyam146

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