RFR: 8376777: Consistent use of nonstatic instead of non_static in ci files

[Joel Sikström]

Hello,

While working towards having more consistent names for nonstatic fields in Valhalla (see [JDK-8376652](https://bugs.openjdk.org/browse/JDK-8376652)), I noticed that we have a few places in the ci files that uses non_static over nonstatic. I suggest we should be consistent in this case and use nonstatic, which is favored in HotSpot.

Testing:
* GHA
* Oracle's tier1

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Commit messages:
 - 8376777: Consistent use of nonstatic instead of non_static in ci files

Changes: https://git.openjdk.org/jdk/pull/29500/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29500&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8376777
  Stats: 6 lines in 3 files changed: 0 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/29500.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29500/head:pull/29500

PR: https://git.openjdk.org/jdk/pull/29500