[jdk21u-dev] RFR: 8333456: CompactNumberFormat integer parsing fails when string has no suffix

[Roland Mesde]

Backporting JDK-8333456: CompactNumberFormat integer parsing fails when string has no suffix. Adds logic to check to make sure position does not exceed the string length before deciding to check for a decimal symbol.

Ran GHA Sanity Checks (passed) and related test (passed).

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Commit messages:
 - Backport 6238bc8da2abe7a1f0cdd98c0af01e9ba1869ec3

Changes: https://git.openjdk.org/jdk21u-dev/pull/2468/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2468&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8333456
  Stats: 455 lines in 2 files changed: 454 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2468.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2468/head:pull/2468

PR: https://git.openjdk.org/jdk21u-dev/pull/2468