RFR: 8150564: Migrate useful ExtendedRobot methods into awt.Robot [v10]

[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 two additional commits since the last revision:

 - add code tag to specifications in Robot
 - fix syncdelay in ER

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Changes:
  - all: https://git.openjdk.org/jdk/pull/22044/files
  - new: https://git.openjdk.org/jdk/pull/22044/files/84384f92..420c4221

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=22044&range=09
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22044&range=08-09

  Stats: 17 lines in 2 files changed: 5 ins; 1 del; 11 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