Rename the BlacklistPackagePrefix family of classes and their related functions.

Rename BlacklistPackagePrefix to IgnoredPackagePrefix to reflect the fact that
this comes from the bazelignore file in repositories. Update all code references
referring to the blacklist to use a new variable or method name to reflect the
new class name.

RELNOTES: None
PiperOrigin-RevId: 318117736
diff --git a/src/test/java/com/google/devtools/build/lib/packages/GlobCacheTest.java b/src/test/java/com/google/devtools/build/lib/packages/GlobCacheTest.java
index d437c1e..e2263af 100644
--- a/src/test/java/com/google/devtools/build/lib/packages/GlobCacheTest.java
+++ b/src/test/java/com/google/devtools/build/lib/packages/GlobCacheTest.java
@@ -91,12 +91,12 @@
     createCache();
   }
 
-  private void createCache(PathFragment... blacklistedDirectories) {
+  private void createCache(PathFragment... ignoredDirectories) {
     cache =
         new GlobCache(
             packageDirectory,
             PackageIdentifier.createInMainRepo("isolated"),
-            ImmutableSet.copyOf(blacklistedDirectories),
+            ImmutableSet.copyOf(ignoredDirectories),
             new CachingPackageLocator() {
               @Override
               public Path getBuildFileForPackage(PackageIdentifier packageId) {
@@ -121,7 +121,7 @@
   }
 
   @Test
-  public void testBlacklistedDirectory() throws Exception {
+  public void testIgnoredDirectory() throws Exception {
     createCache(PathFragment.create("isolated/foo"));
     List<Path> paths = cache.safeGlobUnsorted("**/*.js", true).get();
     assertPathsAre(