RFR: 8315097: Rename createJavaProcessBuilder [v7]

[Leo Korinth]

> This pull request renames `createJavaProcessBuilder` to `createLimitedTestJavaProcessBuilder` and renames `createTestJvm` to `createTestJavaProcessBuilder`. Both are implemented through a private `createJavaProcessBuilder`. It also updates the java doc.
> 
> This is so that it should be harder to by mistake use `createLimitedTestJavaProcessBuilder` that is problematic because it will not forward JVM flags to the tested JVM.

Leo Korinth has updated the pull request incrementally with one additional commit since the last revision:

  fix copyright year and indentation

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Changes:
  - all: https://git.openjdk.org/jdk/pull/15452/files
  - new: https://git.openjdk.org/jdk/pull/15452/files/2f57a32d..4cc3865a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15452&range=06
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15452&range=05-06

  Stats: 23 lines in 1 file changed: 0 ins; 0 del; 23 mod
  Patch: https://git.openjdk.org/jdk/pull/15452.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15452/head:pull/15452

PR: https://git.openjdk.org/jdk/pull/15452