[epic] Implement upgrade tests for OperatorController

[joelanford]

In order to have confidence that feature additions and bug fixes are reflected after an upgrade, we should add a suite of upgrade tests that:

1. Install the most recent public release.
2. Create objects that sufficiently exercise our API surface and behaviors.
3. Upgrade in place from the most recent public release to a build from the current commit.
4. Make assertions that prove that changes from the current commit are reflected.

[acmenezes]

/assign

[acmenezes]

Hi @joelanford , I'm sorry I didn't have much progress on this task on the previous week. I'm quite busy with some partner work here. I'll just drop an /unassign here to open space for others to work on this. As soon as I have a few extra cycles I'll be back.

[acmenezes]

/unassign