8344833: CTW: Make failing on zero classes optional

[lepestock]

For CTW, zero classes in provided jar is now a failure.
This creates noisy and blocking false positives in fuzzy/mass scale runs, where we use jar archives from random sources, unchecked or randomly generated, etc.

This PR makes this behaviour controllable. Default reaction is a failure, like before.

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Progress

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Issue

• JDK-8344833: CTW: Make failing on zero classes optional (Enhancement - P4)

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• 00: Full (286c47e0)