Expose public constant for spring.aot.processing system property

Closes gh-33388

spring-context/src/main/java/org/springframework/context/aot/AbstractAotProcessor.java

@@ -47,11 +47,11 @@
 public abstract class AbstractAotProcessor<T> {
 
 	/**
-	 * The name of a system property that is made available when the processor
-	 * runs.
+	 * The name of a system property that is made available when the processor runs.
+	 * @since 6.2
 	 * @see #doProcess()
 	 */
-	private static final String AOT_PROCESSING = "spring.aot.processing";
+	public static final String AOT_PROCESSING = "spring.aot.processing";
 
 	private final Settings settings;
 
@@ -125,6 +125,7 @@ protected void writeHints(RuntimeHints hints) {
 		writer.write(hints);
 	}
 
+
 	/**
 	 * Common settings for AOT processors.
 	 */
@@ -140,7 +141,6 @@ public static final class Settings {
 
 		private final String artifactId;
 
-
 		private Settings(Path sourceOutput, Path resourceOutput, Path classOutput, String groupId, String artifactId) {
 			this.sourceOutput = sourceOutput;
 			this.resourceOutput = resourceOutput;
@@ -149,15 +149,13 @@ private Settings(Path sourceOutput, Path resourceOutput, Path classOutput, Strin
 			this.artifactId = artifactId;
 		}
 
-
 		/**
 		 * Create a new {@link Builder} for {@link Settings}.
 		 */
 		public static Builder builder() {
 			return new Builder();
 		}
 
-
 		/**
 		 * Get the output directory for generated sources.
 		 */
@@ -214,12 +212,10 @@ public static final class Builder {
 			@Nullable
 			private String artifactId;
 
-
 			private Builder() {
 				// internal constructor
 			}
 
-
 			/**
 			 * Set the output directory for generated sources.
 			 * @param sourceOutput the location of generated sources