update operator-sdk to 1.28.0 & apply all migrations

[mh013370]

Q	A
Bug fix?	no
New feature?	no
API breaks?	no
Deprecations?	no
License	Apache 2.0

What's in this PR?

Update operator-sdk to 1.28.0 and apply all kubebuilder migrations specified here:

https://sdk.operatorframework.io/docs/upgrading-sdk-version/

I upgraded my local operator-sdk by following their installation instructions documented here: https://sdk.operatorframework.io/docs/installation/

Checklist

• [x] Implementation tested
• [x] Error handling code meets the guideline
• [x] Logging code meets the guideline
• [x] User guide and development docs updated (if needed)
• [x] Append changelog with changes

[r65535]

Looks good to me!

I guess we'll perform the go/v4 migrations once it leaves alpha?

[mh013370]

Looks good to me!

I guess we'll perform the go/v4 migrations once it leaves alpha?

Yes i believe so. It's not clear to me at the moment how to migrate, but when we do move to go/v4 we will probably need to apply all of the v4 migrations