Implements task-22428.

Fixes #24621.

Typically, the "published" line appears before the "fingerprint" line.
However, an alternative Tor implementation orders these two lines
differently, which is valid due to the spec. We need to handle this
case by accepting lines in either order.

Fixes #23981.

Implements the final part of task-21414 for CollecTor.

This includes adding property 'OnionPerfSources' and renaming
some markers properly.  In addition, all camel-case occurrences
of 'OnionPerf' have a capitalized 'P' now.

Part of task-21759.

With #22836 being deployed, Tor Metrics parses our index.json and
provides its own directory listings. Time to stop prettifying ours.

Makes test pass again and implements task-23215.
Changes a test descriptor to contain a second annotation.

Part of task-23215.

Implements task-23286 using metrics-lib-2.0.0

Fixes #23255.

Related to #23255.

Implements task20516.

Implements task20515.

Implements #22833.