OKD-453: Dockerfile.openshift: conditionally install frr or frr10 based on OS version

[redhat-chai-bot]

On CentOS Stream 10 (and RHEL 10), FRR version 10 is the default
package named frr. The separate frr10 package does not exist.

This causes builds to fail when the base image is CentOS Stream 10,
because dnf install frr10 cannot find the package.

This change detects the OS major version from /etc/os-release and
installs frr on version 10+ (where FRR 10 is the default) or
frr10 on version 9 (where it exists as a separate package).

---

AI-generated. Review for accuracy.

@Prashanth684 requested in Slack thread

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[Prashanth684]

This fixes OKD builds which have already moved to using centos stream10 base images

[Prashanth684]

/verified by @Prashanth684

[openshift-ci-robot]

@Prashanth684: This PR has been marked as verified by @Prashanth684.

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/verified by @Prashanth684

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[openshift-ci-robot]

@redhat-chai-bot: This pull request references OKD-453 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 bug to target the "5.1.0" version, but no target version was set.

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In response to this:

On CentOS Stream 10 (and RHEL 10), FRR version 10 is the default
package named frr. The separate frr10 package does not exist.

This causes builds to fail when the base image is CentOS Stream 10,
because dnf install frr10 cannot find the package.

This change detects the OS major version from /etc/os-release and
installs frr on version 10+ (where FRR 10 is the default) or
frr10 on version 9 (where it exists as a separate package).

---

AI-generated. Review for accuracy.

@Prashanth684 requested in Slack thread

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the openshift-eng/jira-lifecycle-plugin repository.