Add support for showing "__idle__" in the UI

[mattray]

What does this PR change?

• Adds __idle__ field to UI reports on usage, showing what's not currently in use by the cluster. These values were in the API, just not rendered.

Does this PR relate to any other PRs?

• No

How will this PR impact users?

• Users will now have more accurate results when comparing to their cloud bills.

Does this PR address any GitHub or Zendesk issues?

• Azure AKS inaccurate cost report #2162
• AWS EKS inaccurate cost report #2172

How was this PR tested?

• Locally and with GKE

Does this PR require changes to documentation?

• No

Have you labeled this PR and its corresponding Issue as "next release" if it should be part of the next OpenCost release? If not, why not?

• This will be called out when released, since it's a change in behavior

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Name	Status	Preview	Comments	Updated (UTC)
opencost	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 21, 2024 11:13pm

[sonarcloud]

Quality Gate passed

Issues
0 New issues

Measures
0 Security Hotspots
63.8% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[danijam]

Hey @mattray, I found this via #2162. I see 1.109.0 was released on 6th March. This PR was merged on 21st Feb. I can't see it mentioned on the release details. Did it miss the 1.109.0 release?

[mattray]

The 1.109 branch was made before the merge, so it will be in the upcoming 1.110 release.