RFR: 8354919: Move HotSpot .editorconfig into the global .editorconfig

[Julian Waters]

The src/hotspot directory should ideally only be used for HotSpot source files, and we should avoid polluting it with an .editorconfig. A cleaner solution exists since we can just specify the desired code formatting for HotSpot as an override in the root .editorconfig

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Commit messages:
 - Move HotSpot formatting rules to global .editorconfig
 - Delete src/hotspot/.editorconfig

Changes: https://git.openjdk.org/jdk/pull/24714/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24714&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8354919
  Stats: 7 lines in 2 files changed: 4 ins; 3 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/24714.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24714/head:pull/24714

PR: https://git.openjdk.org/jdk/pull/24714