ROX-30390: Add grafana dashboard for Update Computer

[vikin91]

Description

This adds a new dashboard for the Transition-Based update computer. This is how it looks currently

User-facing documentation

• CHANGELOG.md is updated OR update is not needed
• documentation PR is created and is linked above OR is not needed

Testing and quality

• the change is production ready: the change is GA, or otherwise the functionality is gated by a feature flag
• CI results are inspected

Automated testing

• added unit tests
• added e2e tests
• added regression tests
• added compatibility tests
• modified existing tests

How I validated my change

• In grafana by looking at it

[vikin91]

This change is part of the following stack:

• ROX-30390: Adjust grafana dashboards to recent changes #16789
  • ROX-30390: Add grafana dashboard for Update Computer #16790 ◀

_{Change managed by git-spice.}

[openshift-ci]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[rhacs-bot]

Images are ready for the commit at 7a16135.

To use with deploy scripts, first export MAIN_IMAGE_TAG=4.9.x-762-g7a161351e5.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 48.80%. Comparing base (b3f0899) to head (7a16135).

Additional details and impacted files

@@                            Coverage Diff                             @@
##           piotr/ROX-30390-update-grafana-dashboards   #16790   +/-   ##
==========================================================================
  Coverage                                      48.80%   48.80%           
==========================================================================
  Files                                           2681     2681           
  Lines                                         200443   200443           
==========================================================================
+ Hits                                           97825    97827    +2     
+ Misses                                         95010    95008    -2     
  Partials                                        7608     7608           

Flag	Coverage Δ
go-unit-tests	48.80% <ø> (+<0.01%)	⬆️

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