Remove from `TIFFField.getValueAsString` the rudimentary reduction in terms in the conversion of `RATIONAL` and `SRATIONAL` field values to a string. Also, add a test.
------------- Commit messages: - 8152293: Incomplete fraction reduction in getValueAsString() for TIFFTag.TIFF_RATIONAL, TIFFTag.TIFF_SRATIONAL Changes: https://git.openjdk.org/jdk/pull/24141/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24141&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8152293 Stats: 193 lines in 2 files changed: 170 ins; 20 del; 3 mod Patch: https://git.openjdk.org/jdk/pull/24141.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/24141/head:pull/24141 PR: https://git.openjdk.org/jdk/pull/24141
