git: openjdk/jdk-sandbox: jep486: Remove left over policy files

[duke]

Changeset: 46970f8f
Branch: jep486
Author:    Alan Bateman <alan.bateman at oracle.com>
Date:      2024-10-20 07:32:56 +0000
URL:       https://git.openjdk.org/jdk-sandbox/commit/46970f8f01ca000bb43ad55a20543d2b02b36dd0

Remove left over policy files

- test/jdk/javax/imageio/CachePremissionsTest/rw.policy
- test/jdk/javax/imageio/CachePremissionsTest/rwd.policy
- test/jdk/javax/imageio/CachePremissionsTest/w.policy
- test/jdk/javax/management/Introspector/AnnotationSecurityTest.policy