RFR: 8304896: Update to use jtreg 7.2

[Christian Stein]

Please review the change to update to using jtreg 7.2.

The primary change is to the `jib-profiles.js` file, which specifies the version of jtreg to use, for those systems that rely on this file. In addition, the requiredVersion has been updated in the various `TEST.ROOT` files.

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Commit messages:
 - JDK-8304896: Updated to use jtreg 7.2
 - JDK-8304896: Back to use build number 1
 - JDK-8304896: Use CI build number
 - JDK-8304896: Update to use jtreg 7.2

Changes: https://git.openjdk.org/jdk/pull/13496/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13496&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8304896
  Stats: 9 lines in 8 files changed: 0 ins; 0 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/13496.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13496/head:pull/13496

PR: https://git.openjdk.org/jdk/pull/13496