RFR: 8351626: Update remaining icons to SVG format

[Hannes Wallnöfer]

Please review a change to update the remaining `.png` files used by JavaDoc with `.svg` files. In addition to the looking glass and "x" icons used in the search box this also adds left and right pointing angles used in breadcrumb navigation and sidebar hide/show buttons that previously used glyphs.

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Commit messages:
 - 8351626: Update remaining icons to SVG format

Changes: https://git.openjdk.org/jdk/pull/24007/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24007&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8351626
  Stats: 104 lines in 17 files changed: 72 ins; 4 del; 28 mod
  Patch: https://git.openjdk.org/jdk/pull/24007.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24007/head:pull/24007

PR: https://git.openjdk.org/jdk/pull/24007