[jdk17u-dev] RFR: 8295670: Remove duplication in java/util/Formatter/Basic*.java

[Goetz Lindenmaier]

I backport this for parity with 17.0.17-oracle.

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Commit messages:
 - Backport f84b0ad07c73c305d21c71ec6b8195dc1ee31a3e

Changes: https://git.openjdk.org/jdk17u-dev/pull/3548/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3548&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8295670
  Stats: 29646 lines in 22 files changed: 1511 ins; 27888 del; 247 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3548.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3548/head:pull/3548

PR: https://git.openjdk.org/jdk17u-dev/pull/3548