Fix wait.Poll as it is deprecated

[chanwit]

User Story:

As a Terraform controller dev,
I'd like to replace the deprecated wait.Poll function with a supported alternative,
so that the codebase is up-to-date and avoids potential compatibility issues in the future.

Acceptance Criteria:

• Identify all occurrences of the deprecated wait.Poll function in the codebase
• Replace each occurrence of wait.Poll with an appropriate alternative (e.g. but not limit to wait.PollImmediate or wait.PollUntil)
• Ensure all tests pass and there is no regression in functionality

[yitsushi]

For more context: weaveworks/weave-gitops#3812