bazel: flip --incompatible_restrict_string_escapes default to true

RELNOTES:
--incompatible_restrict_string_escapes=true is now the default.
Unnecessary backslashes such as "\." in string literals are now
an error, instead of being silently treated as "\\.".
To fix the error while preserving behavior, double the backlash.
However, the error is often a sign that the original code was wrong.
PiperOrigin-RevId: 341440132

src/main/java/com/google/devtools/build/lib/packages/semantics/BuildLanguageOptions.java

@@ -526,7 +526,7 @@ public class BuildLanguageOptions extends OptionsBase implements Serializable {
 
   @Option(
       name = "incompatible_restrict_string_escapes",
-      defaultValue = "false",
+      defaultValue = "true",
       documentationCategory = OptionDocumentationCategory.STARLARK_SEMANTICS,
       effectTags = {OptionEffectTag.BUILD_FILE_SEMANTICS},
       metadataTags = {
@@ -718,7 +718,7 @@ public StarlarkSemantics toStarlarkSemantics() {
   public static final String INCOMPATIBLE_REQUIRE_LINKER_INPUT_CC_API =
       "+incompatible_require_linker_input_cc_api";
   public static final String INCOMPATIBLE_RESTRICT_STRING_ESCAPES =
-      "-incompatible_restrict_string_escapes";
+      "+incompatible_restrict_string_escapes";
   public static final String INCOMPATIBLE_RUN_SHELL_COMMAND_STRING =
       "+incompatible_run_shell_command_string";
   public static final String INCOMPATIBLE_STRUCT_HAS_NO_METHODS =

src/test/py/bazel/windows_remote_test.py

@@ -187,7 +187,7 @@ def testJavaTestWithRuntimeRunsRemotely(self):
         'java_runtime(',
         '    name = "jdk8",',
         '    srcs = [],',
-        '    java_home = "' + java_home + '",',
+        '    java_home = ' + repr(java_home) + ',',
         ')',
     ])
     self.ScratchFile(

src/test/shell/integration/modify_execution_info_test.sh

@@ -207,7 +207,7 @@ action_listener(
   visibility = ["//visibility:public"],
 )
 
-extra_action(name = "echo-filename", cmd = "echo Hi \$(EXTRA_ACTION_FILE)")
+extra_action(name = "echo-filename", cmd = "echo Hi \\$(EXTRA_ACTION_FILE)")
 
 py_binary(name = "pybar", srcs=["pybar.py"],)