RFR: 8344524: Remove SecurityManager related code from jdk.jlink module

[Jaikiran Pai]

Can I please get a review for this change which removes SecurityManager usages from `jdk.jlink` module? This addresses https://bugs.openjdk.org/browse/JDK-8344524.

The internal class `jdk.tools.jlink.internal.JlinkPermission` too has been removed as part of this change.

No new tests have been added and existing tier1, tier2 and tier3 tests continue to pass with this change.

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Commit messages:
 - 8344524: Remove SecurityManager related code from jdk.jlink module

Changes: https://git.openjdk.org/jdk/pull/22268/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22268&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8344524
  Stats: 61 lines in 3 files changed: 0 ins; 60 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/22268.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22268/head:pull/22268

PR: https://git.openjdk.org/jdk/pull/22268