[9.3.0] Use no-op path mapper when output paths collide with inputs

[Silic0nS0ldier]

Description

Prevents the path mapper (#6526, --experimental_output_paths=strip) from applying when a collision occurs between mapped input and output paths.

Motivation

Fixes a discovered edge case where a globally applied Java annotation processor had dependent .jar collide when building that same .jar under the default configuration, leading to a AccessDeniedException.

e.g.

$ bazel cquery 'somepath(//product_platform/libs/protogen:protogen, config(//product_platform/libs/protogen:protogen, d373329))'
...
//product_platform/libs/protogen:protogen (e3ee988)
@bazel_tools//tools/jdk:java_plugins_flag_alias (e3ee988)
//tools/error_prone/global_bug_patterns:global_bug_patterns (d373329)
//tools/error_prone/global_bug_patterns/unproducible_value:unproducible_value (d373329)
//product_platform/libs/protogen:protogen (d373329)

$ bazel build //product_platform/libs/protogen:protogen
...
ERROR: /___/product_platform/libs/protogen/BUILD.bazel:7:13: Building product_platform/libs/protogen/libprotogen.jar (18 source files) failed: (Exit 1): java failed: error executing Javac command (from java_library rule target //product_platform/libs/protogen:protogen) external/+java_repositories+openjdk21_linux_x86_64/bin/java '--add-exports=jdk.compiler/com.sun.tools.javac.api=ALL-UNNAMED' '--add-exports=jdk.compiler/com.sun.tools.javac.main=ALL-UNNAMED' ... (remaining 20 arguments skipped)
Remote server execution message: Execution result: ___
java.nio.file.AccessDeniedException: bazel-out/cfg/bin/product_platform/libs/protogen/libprotogen.jar
        at java.base/sun.nio.fs.UnixException.translateToIOException(UnixException.java:90)
        at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:106)
        at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:111)
        at java.base/sun.nio.fs.UnixFileSystemProvider.newByteChannel(UnixFileSystemProvider.java:261)
        at java.base/java.nio.file.spi.FileSystemProvider.newOutputStream(FileSystemProvider.java:482)
        at java.base/java.nio.file.Files.newOutputStream(Files.java:228)
        at com.google.devtools.build.buildjar.jarhelper.JarCreator.execute(JarCreator.java:279)
        at com.google.devtools.build.buildjar.SimpleJavaLibraryBuilder.buildJar(SimpleJavaLibraryBuilder.java:152)
        at com.google.devtools.build.buildjar.SimpleJavaLibraryBuilder.run(SimpleJavaLibraryBuilder.java:119)
        at com.google.devtools.build.buildjar.BazelJavaBuilder.build(BazelJavaBuilder.java:111)
        at com.google.devtools.build.buildjar.BazelJavaBuilder.parseAndBuild(BazelJavaBuilder.java:91)
        at com.google.devtools.build.buildjar.BazelJavaBuilder.lambda$main$0(BazelJavaBuilder.java:52)
        at com.google.devtools.build.lib.worker.WorkRequestHandler$WorkRequestCallback.apply(WorkRequestHandler.java:252)
        at com.google.devtools.build.lib.worker.WorkRequestHandler.respondToRequest(WorkRequestHandler.java:481)
        at com.google.devtools.build.lib.worker.WorkRequestHandler.lambda$startResponseThread$0(WorkRequestHandler.java:433)
        at java.base/java.lang.Thread.run(Thread.java:1583)Use --verbose_failures to see the command lines of failed build steps.

Build API Changes

No

Checklist

• I have added tests for the new use cases (if any).
• I have updated the documentation (if applicable).

Release Notes

RELNOTES: None

Closes #30440.

[Silic0nS0ldier]

CI errors look to be unrelated. Flakes or existing breakages.