[jdk17u-dev] RFR: 8299399: Remove metaprogramming/isArray.hpp

[George Adams]

prerequisite to bumping googletest to 1.13.0

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Commit messages:
 - Backport 71a64a1b7afea4d214f4fe8f0c0085aa959b6d09

Changes: https://git.openjdk.org/jdk17u-dev/pull/2671/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2671&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8299399
  Stats: 110 lines in 3 files changed: 2 ins; 107 del; 1 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/2671.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2671/head:pull/2671

PR: https://git.openjdk.org/jdk17u-dev/pull/2671