RFR: 8068958: Timestamp.from(Instant) should throw when conversion is not possible

[Eamonn McManus]

Multiplying with `*` never produces `ArithmeticException`, so the catch in the existing code is never triggered. `Math.multiplyExact` does produce `ArithmeticException` if the multiplication overflows. So we can use that, and rethrow `IllegalArgumentException` as the specification says.

There is a small compatibility risk, in that code may have been relying on the previous silent overflow, and will now get an exception. But an exception is surely better than the nonsense results that overflow produces.

Thanks to Kurt Kluever for the test cases.

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Commit messages:
 - 8068958: Timestamp.from(Instant) should throw when conversion is not possible

Changes: https://git.openjdk.org/jdk/pull/17181/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17181&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8068958
  Stats: 30 lines in 2 files changed: 29 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/17181.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17181/head:pull/17181

PR: https://git.openjdk.org/jdk/pull/17181