[Bug 48659] New: Job details page: Add links to the first error in a report

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=48659

Bug ID: 48659
           Summary: Job details page: Add links to the first error in a
                    report
           Product: Wine-Testbot
           Version: unspecified
          Hardware: x86
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: unknown
          Assignee: [e-mail]
          Reporter: [e-mail]
      Distribution: ---

When looking at a full WineTest report on the TestBot website finding the
errors can require a lot of scrolling and there is a risk of skipping over
them.

The cache .errors files contain the line of each error and error group.
This makes it possible to add links to the errors:
* The first report line would contain a link pointing to the first report error
(for instance in the form of a down arrow at the start of the line).
* Errors would contain links to the previous/next errors, or to the first/last
report line.
* The last report line would link to the last report error.

Once the first draft is ready the link chain may be tweaked:
* The first line of test units containing errors, could be added to it.
* A second chain link to be set up with only the new failures.