RFR: 8339524: Clean up a few ExtendedRobot tests [v7]

[Alisen Chung]

> Cleaning up tests building ExtendedRobot that shouldn't be.

Alisen Chung has updated the pull request incrementally with one additional commit since the last revision:

  robot init in main, static volatile passed

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Changes:
  - all: https://git.openjdk.org/jdk/pull/20846/files
  - new: https://git.openjdk.org/jdk/pull/20846/files/6a980a45..6b0b6b0a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20846&range=06
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20846&range=05-06

  Stats: 13 lines in 1 file changed: 2 ins; 7 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/20846.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20846/head:pull/20846

PR: https://git.openjdk.org/jdk/pull/20846