RFR: 8324326: Update ICU4C to 74.2

[Hima Bindu Meda]

Updated icu to v74.2. Sanity testing looks fine. Verified build on all platforms

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Commit messages:
 - Revert file permissions similar to master
 - Tab correction
 - Resolve PR error
 - Tab Correction
 - Merge branch 'master' into icu-74
 - updated LICENSE
 - white space corrections
 - Add missing header files
 - Update ICU to v74.2

Changes: https://git.openjdk.org/jfx/pull/1398/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1398&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8324326
  Stats: 10765 lines in 123 files changed: 3601 ins; 1545 del; 5619 mod
  Patch: https://git.openjdk.org/jfx/pull/1398.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1398/head:pull/1398

PR: https://git.openjdk.org/jfx/pull/1398