Flip default for --experimental_ignore_deprecated_instrumentation_spec

This stops using legacy InstrumentationSpec configuration by default for the few native rules which used this legacy configuration (filegroup, shell script, and Python), instead using a configuration which behaves as putting "srcs" under the source_attributes parameter of coverage_common.instrumented_files_info and "deps" and "data" under dependency_attributes.

RELNOTES: Update coverage configuration for Python, filegroup, and shell script rules to distinguish between source and dependency attributes.
PiperOrigin-RevId: 323030795

src/main/java/com/google/devtools/build/lib/analysis/config/CoreOptions.java

@@ -388,7 +388,7 @@ public String getTypeDescription() {
 
   @Option(
       name = "experimental_ignore_deprecated_instrumentation_spec",
-      defaultValue = "false",
+      defaultValue = "true",
       documentationCategory = OptionDocumentationCategory.OUTPUT_PARAMETERS,
       effectTags = {OptionEffectTag.AFFECTS_OUTPUTS},
       help =