8380441: G1: Move G1GCPauseType to G1CollectorState

[tschatzl]

Hi all,

please review this change that moves G1GCPauseType into G1CollectorState.

This improves readability imo as it reduces the scope of that type and puts it together with its source.

Based on #30233, so please review that one first.

Testing: gha

Thanks,
Thomas

---

Progress

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Integration blocker

 ⚠️ Dependency #30233 must be integrated first

Issue

• JDK-8380441: G1: Move G1GCPauseType to G1CollectorState (Enhancement - P4)

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