Followup:
* https://github.com/discourse/discourse/pull/28160
* https://github.com/discourse/discourse/pull/25921
In the previous PRs we added 2 environent variables
to control backtrace output for errors in rspec,
`RSPEC_EXCLUDE_NOISE_IN_BACKTRACE`, and
`RSPEC_EXCLUDE_GEMS_IN_BACKTRACE`
These largely do the same thing, and we want to enable
that behaviour by default.
This commit consolidates them into one env var,
`DISCOURSE_INCLUDE_GEMS_IN_RSPEC_BACKTRACE`, which is
disabled by default, meaning gem backtraces will not
be shown in rspec backtraces by default.
Also for the request spec use case with `RspecErrorTracker`,
we now show an indicator of how many lines were hidden from
the backtrace e.g. "...(21 framework line(s) excluded)",
and for this and the normal rspec backtrace exclusion we
show a warning if `DISCOURSE_INCLUDE_GEMS_IN_RSPEC_BACKTRACE`
is not enabled.
aca6c462a6