Also adds ellipsis to lines in *.out files.

* do not print "up to date" unless running build

* Update cabal-tests

* Add changelog

* Remove accidentally added test generated files

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

- Place "Error:" inside wrappers

  At least for the sake of the testsuite, the "Error:" prefix must be
  inside the bracket BEGIN...END that is added to the Cabal output
  during testing.

- Heuristic to not put "Error:" when already present

  This is because backpack outputs errors in an aligned way (Doc) where
  "Error:" is the introducing line.  Removing this breaks the layout.

- Remove manual "Error:" prefix where `die` adds it automatically.

- Update golden values.

Report possible tests and benchmarks too when erroring because of
multiple available targets.

We test both for single and multiple exe/package.

`new-run` must halt on ambiguities or no compatible exes,
and must run the exe if one can be uniquely selected between
packages and components.