RFR: 8318614: Update WebKit to 617.1

[Hima Bindu Meda]

This PR updates webkit to v617.1. Verified build on Mac,Windows and linux.
Sanity testing looks fine. No issues observed in HelloWebView as well

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Commit messages:
 - Remove unwanted files
 - Update webkit to v617.1

Changes: https://git.openjdk.org/jfx/pull/1328/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1328&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8318614
  Stats: 289254 lines in 6439 files changed: 170206 ins; 83308 del; 35740 mod
  Patch: https://git.openjdk.org/jfx/pull/1328.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1328/head:pull/1328

PR: https://git.openjdk.org/jfx/pull/1328