We still sometimes have problems checking out JTReg build dependencies. [JDK-8342988](https://bugs.openjdk.org/browse/JDK-8342988) makes it less pronounced, but it still happens. We might need to do a retries for JTReg builds to make them more reliable.
Additional testing: - [x] GHA (seeing retries with deliberately broken JTReg build) - [x] GHA (passing JTReg build) ------------- Commit messages: - Work Changes: https://git.openjdk.org/jdk/pull/21758/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21758&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8343190 Stats: 18 lines in 1 file changed: 16 ins; 0 del; 2 mod Patch: https://git.openjdk.org/jdk/pull/21758.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/21758/head:pull/21758 PR: https://git.openjdk.org/jdk/pull/21758
