RFR: 8344159: Add lint warnings for unnecessary warning suppression [v2]

[Archie Cobbs]

> This PR adds a new compiler warning for `@SuppressWarnings` annotations that don't actually suppress any warnings.
> 
> Summary of code changes:
> 
> * Add new warning and associated lint category `"suppression"`
> * Update `LintMapper` to keep track of which `@SuppressWarnings` suppressions have been validated ¹
> * Update `Log.warning()` so it validates any current suppression of the warning's lint category in effect.
> * Add a new `validate` parameter to `Lint.isEnabled()` and `Lint.isSuppressed()` that specifies whether to also validate any current suppression.
> * Add `Lint.isActive()` to check whether a category is enabled _or_ suppression of the category is being tracked - in other words, whether the warning calculation needs to be performed. Used for non-trivial warning calculations.
> * Add `-Xlint:-suppression` flags to `*.gmk` build files so the build doesn't break
> 
> ¹ The suppression of a lint category is "validated" as soon as it suppresses some warning in that category

Archie Cobbs has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 131 commits:

 - Merge branch 'master' into JDK-8344159 to fix conflicts.
 - Add clarifying comment.
 - Merge branch 'master' into JDK-8344159
 - Change inner class name to avoid shadowing superclass name.
 - Add a couple of code clarification comments.
 - Refactor test to avoid requiring changes to TestRunner.
 - Remove unnecessary -Xlint:-suppression flags.
 - Minor cleanups.
 - Add OPTIONS, PATH, and SUPPRESSION to the regression test.
 - Minor regression test cleanups.
 - ... and 121 more: https://git.openjdk.org/jdk/compare/9093d3a0...7714095d

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Changes: https://git.openjdk.org/jdk/pull/25167/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25167&range=01
  Stats: 1658 lines in 33 files changed: 1485 ins; 49 del; 124 mod
  Patch: https://git.openjdk.org/jdk/pull/25167.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25167/head:pull/25167

PR: https://git.openjdk.org/jdk/pull/25167