hh: Leverage 5.2 features

[cirocosta]

Hey,

With the new features that are coming to v5.2 (see https://raw.githubusercontent.com/concourse/release-notes/master/lit/v5.2.0.lit and helm/charts#13295), we're able to some cool things like:

• naming the hush-house cluster as hush-house
• enabling cacheing for our secrets lookups
• having an audit trail of user interaction through logs

Regarding the latter, we should be able to get a nice vis of those actions by crafting some metric queries against our logs in stackdriver 🤔

Thanks!

[cirocosta]

oh, this has actually been done already 😅

the only one that is missing is enabling caching for our secret lookups as there's not a good way for us to know the effect of that (we miss metrics in that part).

Thanks!