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
diff --git a/src/test/shell/integration/modify_execution_info_test.sh b/src/test/shell/integration/modify_execution_info_test.sh
index 6d31b21..3b2ef9d 100755
--- a/src/test/shell/integration/modify_execution_info_test.sh
+++ b/src/test/shell/integration/modify_execution_info_test.sh
@@ -207,7 +207,7 @@
   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"],)