Upgrade script updates (init container)

[santhoshatdell]

Description

• Updated upgrade-script to handle upgrade with no existing RGs and to properly add the new migrationgroup CRD.
• Updated go mod reference to fix twistlock vulnerability.

GitHub Issues

List the GitHub issues impacted by this PR:

GitHub Issue #
dell/csm#432

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?

Tested upgrade of replication module with isilon and made sure existing replicationgroup CRD is updated & migrationgroup CRD is created.
init container log.txt