Add prometheus scraping and grafana support to charmed katib-controller operator

[jardon]

What this PR does / why we need it:
These changes add support for prometheus scraping and providing a grafana dashboard to the charmed katib-controller operator. With the changes you can do the following to connect the applications and enable scraping:

juju relate prometheus-k8s katib-controller
juju relate grafana-k8s katib-controller

Checklist:

• Docs included if any changes are user facing

[aws-kf-ci-bot]

Hi @jardon. Thanks for your PR.

I'm waiting for a kubeflow member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[coveralls]

Coverage decreased (-0.4%) to 73.706% when pulling f27be59 on jardon:monitoring into 9c88bbc on kubeflow:master.

[Arhell]

/ok-to-test

[ca-scribner]

/retest

[ca-scribner]

I think this just failed because the github runner was particularly slow. Not sure how to get the tests to rerun though

[gaocegege]

I rerun the jobs manually.

[ca-scribner]

ty! We bumped the timeout on the flaky test too so it shouldn't fail like it did before. This should be good to go now

[johnugeorge]

@ca-scribner Can you lgtm this PR if it is ready to be merged?

[ca-scribner]

/lgtm

[johnugeorge]

/approve

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ca-scribner, jardon, johnugeorge

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