Enhancing flexibility of extra image containers

[mfordjody]

What this PR does / why we need it:

Enhance the flexibility of kube-rbac-proxy image parameters to avoid immutability of image parameters.

Which issue this PR fixes

(optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged)

• fixes #

Special notes for your reviewer:

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
• [x] Commits follow the Kong commit message guidelines

[CLAassistant]

All committers have signed the CLA.

[mfordjody]

@tao12345666333 Can you help review this?

[tao12345666333]

Thank you for your contributions. Let me take a look