feat(detected-fields): use /detected_fields API

[svennergr]

Adds support for structured metadata using the detected_fields API endpoint.

Notes for your reviewer:
Firstly, I'm sorry for the size of this PR.

This PR changes a bunch of how the application works.

• The parser variable is no longer used
• • except as a hack to get the log context query working (todo open issue in grafana/grafana)
• We no longer have a concept of "this response is json or logfmt or mixed"
• • Instead each field is checked against the response in detected_fields, and we use the parser from there, if multiple parsers are defined in the response, we'll use mixed
• If a field is included in a query, we will use the appropriate parser
• If multiple fields, with multiple parsers are included in a query, we will use mixed
• • Unless structured metadata and single other parser is used, then we should just use one
• Queries should be overall more optimal, line-filters and patterns are now coming before the parsers
• • We should only ever use the minimum required set of parsers
• • • The exception is the patterns and log panel queries, which will always use both parsers so the list of labels is consistent between detected_fields (also getting both parsers)
• Bug fixes
• • memoization in sorting was causing some time series queries to run, but the panels would never update
• • Aggregated field breakdown was re-rendering all panels, causing queries to get cancelled and then re-inited, this should be fixed now as well (but still a problem in the labels, todo create follow up issue)
• • When deleting content out of the line-filter, the empty line filter would still be included in the query unless the user clicked the "x". Now just deleting the content removes the line-filter from all queries
• New features
• • Since the detected_fields is sorted by cardinality desc, we pushed up all the non-performant time-series to the top, which was eating up browser resources
• • • Pulled in the UI from explore to only show 20 series by default, and allow the user to manually show more
• e2e rehaul:
• • Tracked down flaking tests, and updated how we block queries to help speed things up and reduce strain on the testing loki instance
• • Added a bunch of tests, some json coverage, new helper methods, and more!

[gtk-grafana]

e2e tests are broken against grafana/loki:main-aa1ac99 due to grafana/loki#14053, but with a local loki I can confirm e2e tests are working.

This should pass e2e tests after we update the docker compose files with a loki version containing a fix for grafana/loki#14053 and grafana/loki#14063.

[matyax]

Log Context is working 👌

[matyax]

👏 👏

[trevorwhitney]

yay 🎉