fix(semver) trim -redhat from KIC tags

[rainest]

What this PR does / why we need it:

Strip -redhat suffix from KIC tags if present.

We use this to indicate Docker image variants. It is not actually a semver pre-release, but the semver functions can't tell the difference.

Release 2.17.1.

Which issue this PR fixes

• fixes Helm install fails to create rules for kongclusterplugins and kongingress when using an OS tagged image #778

Special notes for your reviewer:

Compare, with the change:

15:12:10-0700 esenin $ helm template ct /tmp/symkong --set ingressController.image.tag=2.9.0-redhat | grep cmetrics -A1
        - name: cmetrics
          containerPort: 10255

15:12:14-0700 esenin $ helm template ct /tmp/symkong --set ingressController.image.tag=2.9.0-other | grep cmetrics -A1 

15:12:23-0700 esenin $

Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• PR is based off the current tip of the main branch.
• Changes are documented under the "Unreleased" header in CHANGELOG.md
• New or modified sections of values.yaml are documented in the README.md
• Commits follow the Kong commit message guidelines