8365052: G1: Remove G1CollectionSet::groups() accessors

[tschatzl]

Hi all,

please review this small change that remove the public G1CollectionSet::groups() accessors because they are never used from outside the G1CollectionSet class.

Testing: local compilation, gha

Thanks,
Thomas

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 ⚠️ Dependency #26670 must be integrated first

Issue

• JDK-8365052: G1: Remove G1CollectionSet::groups() accessors (Enhancement - P4)

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