RFR: 8264139: Suppress removal warnings for Security Manager methods

[Kevin Rushforth]

This PR adds the necessary `@SuppressWarnings("removal")` annotations for the recently-integrated security manager deprecation, [JEP 411](https://openjdk.java.net/jeps/411). See openjdk/jdk#4073.

There are four commits:

1. 678b026 : A patch generated by @wangweij to add annotations to the runtime (`modules/*/src/main/java`) using the same automated tooling that he used as part of the implementation of JEP 411.
2. 9698e87 : Same as above for the tests.
3. 1c42cf8 : Manually removes a pair of unused imports, one of which (a static import) was causing a removal warning.
4. 4f87d18 : Manually reduced the scope of the annotation where it was added to an entire class, or to a large method where only a small part of the method uses a deprecated method. This was done using similar techniques to the following fixes that Weijun did in openjdk/jdk#4172.
 
The first two commits represent the bulk of the changes. Other than scanning to ensure that there are no obvious errors, and testing, they probably don't need the same level of scrutiny as the manual changes do.

I tested this on all three platforms by doing a build / test with `JDK_HOME` set to a local JDK 17 ea build that includes the fix for JEP 411. I ran the build with `gradle -PLINT=removal` and verified that there were removal warnings for the security manager APIs without this fix and none with this fix.

NOTE: The following files under `modules/javafx.web/src/android` and `modules/javafx.web/src/ios` were not processed by the automated tool. As I have no way to compile them, I chose not to manually fix them either, but doing so would be trivial as a follow-up fix if desired.


modules/javafx.web/src/android/java/com/sun/webkit/Timer.java
modules/javafx.web/src/android/java/com/sun/webkit/WebPage.java
modules/javafx.web/src/android/java/javafx/scene/web/WebEngine.java
modules/javafx.web/src/ios/java/javafx/scene/web/ExportedJavaObject.java
modules/javafx.web/src/ios/java/javafx/scene/web/HTMLEditorSkin.java
modules/javafx.web/src/ios/java/javafx/scene/web/JS2JavaBridge.java
modules/javafx.web/src/ios/java/javafx/scene/web/WebEngine.java

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Commit messages:
 - Narrow the scope of @SuppressWarnings("removal") annotation
 - Remove unused security manager imports
 - Suppress removal warnings for Security Manager methods in tests
 - 8264139: Suppress removal warnings for Security Manager methods

Changes: https://git.openjdk.java.net/jfx/pull/528/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jfx&pr=528&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8264139
  Stats: 586 lines in 194 files changed: 464 ins; 3 del; 119 mod
  Patch: https://git.openjdk.java.net/jfx/pull/528.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx pull/528/head:pull/528

PR: https://git.openjdk.java.net/jfx/pull/528