fix: output was silenced on task fail with keep-order

[artemisart]

I moved the keep-order output before the exit on fail so that we can see the task outputs.
I also added the task timings for --output timed and keep-order + added final timing for all output types (splitting fn timings() in timings() + task_timings()) is that ok?
Fixes #5077 #5078

Unfortunately the e2e test is flaky, sometimes I get:

$ mise run -o keep-order all
E2E assertion failed: [mise run -o keep-order all] expected '[a] a
[b] b' but got '[b] $ echo b ; exit 1
[a] $ echo a
[b] b
Finished in 70.3ms
[b] ERROR task failed'
tasks/test_task_keep_order: 3s
E2E test tasks/test_task_keep_order failed: exited with status code 1

And sometimes everything is fine (the difference is outputing or not the commandlines executed). I don't get why I have this error here and not on the other tests.

[artemisart]

Hah some idea on the flaky test: assert() check part of the output, however the order is not guaranted when running parallel tasks so if the output of a task is displayed before the commandline of another one, the assert fail because the output of all tasks is not continuous.

EDIT: better guess, task b in my test can fail before a has started to run, so it's stopped and we have no output from a. Sorry I missed this, will add another PR.