[jdk21u-dev] RFR: 8313621: test/jdk/jdk/internal/math/FloatingDecimal/TestFloatingDecimal should use RandomFactory

[Aleksey Shipilev]

Clean backport to improve test and parity with 21.0.3-oracle.

Additional testing:
 - [x] Affected tests still passes

-------------

Commit messages:
 - Backport 864a876ebfdf745b0e1f875c3e3668380f2498a7

Changes: https://git.openjdk.org/jdk21u-dev/pull/17/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=17&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8313621
  Stats: 119 lines in 1 file changed: 11 ins; 78 del; 30 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/17.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/17/head:pull/17

PR: https://git.openjdk.org/jdk21u-dev/pull/17