Rework CI jobs to try reducing CI duration (#1903)

CI duration is quite long: the longest jobs is the "Performance" one.
Try to reduce the overall duration: that job (and some others) will not
be triggered for each PR/commit anymore, but asynchronously, once a day
(this scheduling seems right since the frequency of the PR/commits in
the project).
It should be possibly to trigger them manually, via GUI, anyway.

Remove two identical jobs; we already tests ASAN with 4 different
compilers.

After 9eff0754 it is safe to reduce fuzzing time.

Bottom line: try to have as upper-time of CI tests the duration of the
fuzzing jobs

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