perf test: Run parallel tests in two passes

In pass 1 run all tests that succeed when run in parallel. In pass 2
sequentially run all remaining tests that are flagged as
"exclusive". Sequential and dont_fork tests keep to run in pass 1.
Read the exclusive flag from the shell test descriptions, but remove
from display to avoid >100 characters. Add error handling to finish
tests if starting a later test fails. Mark the task-exit test as
exclusive due to issues reported-by James Clark.

Tested-by: James Clark <[email protected]>
Signed-off-by: Ian Rogers <[email protected]>
Cc: Colin Ian King <[email protected]>
Cc: Howard Chu <[email protected]>
Cc: Weilin Wang <[email protected]>
Cc: Ilya Leoshkevich <[email protected]>
Cc: Thomas Richter <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Dapeng Mi <[email protected]>
Cc: Athira Jajeev <[email protected]>
Cc: Michael Petlan <[email protected]>
Cc: Veronika Molnarova <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Namhyung Kim <[email protected]>

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