RFR: 8343040: Clean up references to JRE in the launcher code

[Jaikiran Pai]

Can I please get a review of this change which cleans up references to "JRE" from the launcher's code?

No functional changes have been introduced in this change.

No new tests have been introduced and existing tests in tier1, tier2 and tier3 continue to pass in our CI against Linux, macosx and Windows.

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Commit messages:
 - 8343040: Clean up references to JRE in the launcher code

Changes: https://git.openjdk.org/jdk/pull/21704/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21704&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8343040
  Stats: 161 lines in 8 files changed: 1 ins; 27 del; 133 mod
  Patch: https://git.openjdk.org/jdk/pull/21704.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21704/head:pull/21704

PR: https://git.openjdk.org/jdk/pull/21704