RFR: 8150564: Migrate useful ExtendedRobot methods into awt.Robot [v27]

[Alisen Chung]

> Some useful methods in ExtendedRobot should be migrated into Robot itself so that ExtendedRobot can be removed in the future. The tests using ExtendedRobot for these migrated methods are changed to use only Robot (removing unnecessary building of ExtendedRobot).

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

  revert robot set/get for step delay/length and readd glide(int,int,int,int,int,int), remove restriction on dist < stepLength and corresponding IAE from spec

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Changes:
  - all: https://git.openjdk.org/jdk/pull/22044/files
  - new: https://git.openjdk.org/jdk/pull/22044/files/ead01714..c0b1a260

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22044&range=26
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22044&range=25-26

  Stats: 109 lines in 1 file changed: 32 ins; 63 del; 14 mod
  Patch: https://git.openjdk.org/jdk/pull/22044.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22044/head:pull/22044

PR: https://git.openjdk.org/jdk/pull/22044