8311: Ensure ./build.sh --installCore respects --skipJDPMulticastTests

[skarsaune]

The fix for https://bugs.openjdk.org/browse/JMC-7539 does not work as intended as the JDP multicast tests reside in core due to https://bugs.openjdk.org/browse/JMC-7069

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Issue

• JMC-8311: Ensure ./build.sh --installCore respects --skipJDPMulticastTests (Bug - P4) ⚠️ Issue is not open.

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[mlbridge]

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• 00: Full (335920fb)

[skarsaune]

Duplicate of #611