Add tests for disabling Webservice, Sidekiq, and/or Migrations

Summary

Note: this is currently blocked on &28 (closed).

Context: !287 (comment 733642584)

We've added support in the Operator for addressing upgrades by following a specific set of steps. That set of steps needs to consider that Webservice, Sidekiq, and/or Migrations components can be disabled.

Support for disabling these components was added in !287 (merged), but due to the broader issue of test implementation (tracked by &28 (closed)), it was not feasible to add tests covering these cases within that MR.

Acceptance criteria

• Tests are added that validate functionality for Webservice, Sidekiq, and/or Migrations being disabled