Update resource's status only on change

[juldrixx]

Q	A
Bug fix?	no
New feature?	yes
API breaks?	no
Deprecations?	no
Related tickets	-
License	Apache 2.0

What's in this PR?

Update controllers to update resource status only if a modification has been made.

Why?

In GKE, even if no changes have been made to the state, the update call always generates logs. So the more resources you have, the more logs you have, and since in GCP these logs are invoiced, the bill becomes high. And also to reduce the load on K8S.

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

[mh013370]

This seems okay to me. I verified that in each controller, the status is fetched immediately and that's what is used for comparison. LGTM