WIP: CCO-784: add flag to configure minimum TLS version for webhook server

[jstuever]

This commit introduces a new command-line flag --tls-min-version to the webhook server. This allows operators to specify the minimum supported TLS version (1.0, 1.1, 1.2, or 1.3), improving security flexibility by allowing the enforcement of stricter TLS protocols.

Assisted-by: gemini-3-pro-preview

[openshift-ci-robot]

@jstuever: This pull request references CCO-784 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 "4.21.0" version, but no target version was set.

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In response to this:

This commit introduces a new command-line flag --tls-min-version to the webhook server. This allows operators to specify the minimum supported TLS version (1.0, 1.1, 1.2, or 1.3), improving security flexibility by allowing the enforcement of stricter TLS protocols.

Assisted-by: gemini-3-pro-preview

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

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[openshift-ci]

@jstuever: 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/e2e-aws	50ab718	link	true	/test e2e-aws

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[2uasimojo]

NB: I think we also want tls-cipher-suites; and eventually something about "curves" once openshift/api#2583 lands.