syz-manager: re-minimize a subset of corpus programs

The current fuzzing algorithm in syzkaller may preserve the poorly
minimized corpus programs forever - they trigger a lot of coverage and
will very likely survive all syzkaller restarts.

As a result, more than 18% of the current syzbot corpus programs are
larger than 25 calls, which is an unreasonably big figure.

Introduce a way to prevent the domination of the bigprograms in the
corpus.

Every corpus retriage, pick up to 50 seeds among the 10% largest corpus
programs and re-minimize them. Hopefully, this should reduce the
magnitude of the problem.

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