RFR: JDK-8295859 Update Manual Test Groups [v2]

[Bill Huang]

> The purpose of this task is to add the difference between -manual jdk_core and jdk_core_manual to the jdk_core_manual test goal. Furthermore, in order to streamline the manual test execution process, a new test group called jdk_core_manual_human has been created for manual tests that demand extra preparation or test input.

Bill Huang has updated the pull request incrementally with one additional commit since the last revision:

  Implemented review comments.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/12840/files
  - new: https://git.openjdk.org/jdk/pull/12840/files/361985ba..32496d97

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12840&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12840&range=00-01

  Stats: 7 lines in 1 file changed: 0 ins; 6 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/12840.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/12840/head:pull/12840

PR: https://git.openjdk.org/jdk/pull/12840