[jdk20u] RFR: 8307466: java.time.Instant calculation bug in until and between methods

[Roger Riggs]

Backport the fix for [JDK-8307466](https://bugs.openjdk.org/browse/JDK-8307466) from openjdk/jdk. 
The implementation of java.time.Instant.until(I2, ChronoUnit) in some cases did not correctly borrow or carry from the nanos to the seconds when computing using ChronoUnit.MILLIS or ChronoUnit.MICROS.

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Commit messages:
 - Backport 356667f1559396b09e0b830d92978f2ea7a9300b

Changes: https://git.openjdk.org/jdk20u/pull/78/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk20u&pr=78&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8307466
  Stats: 78 lines in 2 files changed: 70 ins; 0 del; 8 mod
  Patch: https://git.openjdk.org/jdk20u/pull/78.diff
  Fetch: git fetch https://git.openjdk.org/jdk20u.git pull/78/head:pull/78

PR: https://git.openjdk.org/jdk20u/pull/78