Add support for Kubernetes v1.28.0

[rensyct]

Description

This PR

1. Adds support for Kubernetes v1.28.0
2. Updates the support matrix in Readme.md
3. Updates the range for supported versions of OpenShift

GitHub Issues

List the GitHub issues impacted by this PR:

GitHub Issue #
dell/csm#947

Checklist:

• I have performed a self-review of my own code to ensure there are no formatting, vetting, linting, or security issues
• I have verified that new and existing unit tests pass locally with my changes
• I have not allowed coverage numbers to degenerate
• I have maintained at least 90% code coverage
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have maintained backward compatibility

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Please also list any relevant details for your test configuration

1. Installed the operator followed by Unity driver install in non olm environment
2. Installed the operator followed by Unity driver install in olm environment
3. Tested uninstall of driver followed by operator uninstall in both olm and non olm environment

Screenshots