Remove HASH_SERIAL_MURMUR3 / serial32BitMurmurHash3

[bdice]

Description

This PR closes #11296. While implementing Spark list hashing in #11292, I noticed that HASH_SERIAL_MURMUR3 does not appear to be used except in tests. It is not exposed in Python. While it is exposed in the JNI bindings, it is not used by spark-rapids. I discussed this with @rwlee and it seems that this feature was added only for parallel design with the Spark serial hash implementation in #6781, which is superseded by #11292. We do not need to keep this vestigial feature.

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

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[bdice]

rerun tests

[brandon-b-miller]

cython approval

[davidwendt]

Thanks for doing this. Gotta like negative lines of code.

[bdice]

@gpucibot merge