RFR: 8317327 Remove JT_JAVA dead code in jib-profiles.js

[Ludvig Janiuk]

make/conf/jib-profiles.js passes JT_JAVA in the testOnlyProfiles. This can be used to control jtreg's launcher script, but we don't launch that way anymore, we launch jtreg directly using jtreg.jar. Therefore this is dead code and should be removed.

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Commit messages:
 - 8317327 Remove JT_JAVA dead code in jib-profiles.js

Changes: https://git.openjdk.org/jdk/pull/15992/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15992&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8317327
  Stats: 4 lines in 1 file changed: 0 ins; 3 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/15992.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15992/head:pull/15992

PR: https://git.openjdk.org/jdk/pull/15992