RFR: 8339524: Clean up a few ExtendedRobot tests [v8]

[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:

  import to avoid full qualified names

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Changes:
  - all: https://git.openjdk.org/jdk/pull/20846/files
  - new: https://git.openjdk.org/jdk/pull/20846/files/6b0b6b0a..2750ad7b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20846&range=07
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20846&range=06-07

  Stats: 4 lines in 1 file changed: 0 ins; 1 del; 3 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