Implement end to end test cases for plugin life cycle use cases with central repository

[chandrareddyp]

Describe the feature request Currently, we have E2E test cases for the plugin life cycle, but they are specific to OCI repository; we need to implement plugin life cycle E2E test cases for the Central repository. Make all below commands use cases (with negative use cases) covered in the E2E tests implementation:

tanzu plugin search
tanzu plugin install
tanzu plugin delete
tanzu plugin describe
tanzu plugin list
tanzu plugin source add/update/list/delete
tanzu plugin group search
tanzu plugin group describe
tanzu plugin install all --group group_name
tanzu plugin install --group group_name
tanzu plugin sync

make sure these test cases are executed as part of the E2E github pipeline

Describe alternative(s) you've considered

Additional context