feat: update docker secret handling to use .dockerconfigjson format.

[leozhang2018]

What this PR does / Why we need it:

• Changed the format of Docker configuration from .dockercfg to .dockerconfigjson in CreateOrUpdateRegistrySecret and createOrUpdateRegistrySecrets functions.
• Updated the secret type from corev1.SecretTypeDockercfg to corev1.SecretTypeDockerConfigJson.
• Enhanced UpdateOrCreateSecret function to handle immutable secret types by deleting and recreating the secret if the type changes.

Does this PR introduce a user-facing change?

• API change
• database schema change
• upgrade assistant change
• change in non-functional attributes such as efficiency or availability
• fix of a previous issue

[leozhang2018]

Preparing review...

[leozhang2018]

Preparing review...