Redefine bucket/resource alerts to be more exact

[jeniawhite]

Following bug: https://bugzilla.redhat.com/show_bug.cgi?id=1760358

Description of problem:

If a noobaa bucket's underlying AWS bucket is deleted,  Object Service dashboard doesn't show the correct "Target S3 bucket does not exist" alert that can be found in Noobaa UI, but the rather misleading "A NooBaa bucket awsbucket is using all of its capacity" and "A NooBaa bucket awsbucket is using 100% of its capacity" 


Version-Release number of selected component (if applicable):

OpenShift version: 4.2.0-0.nightly-2019-09-30-184859


How reproducible:

100%


Steps to Reproduce:

1. Add an AWS bucket as a cloud resource in Noobaa
2. Create a noobaa bucket connected to this resource
3. Delete the AWS bucket


Actual results:

Object Service dashboard shows alerts that the noobaa bucket is using all of its capacity


Expected results:

Object Service dashboard makes it clear to the user what is actually wrong with the bucket

We should change the alerts and trigger a single alert in such cases.