Fix autoupdate handling of carriage return (#4840)

Switching from RE2 to StrReplaceAll because it seems a fair fit for what
actually needs to be done here. Also pick up \t for visibility reasons.

This came up because clangd's LSP-related APIs print carriage returns.

testing/file_test/testdata/escaping.carbon

@@ -0,0 +1,19 @@
+// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
+// Exceptions. See /LICENSE for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+// SET-CAPTURE-CONSOLE-OUTPUT
+// AUTOUPDATE
+// TIP: To test this file alone, run:
+// TIP:   bazel test //testing/file_test:file_test_base_test --test_arg=--file_tests=testing/file_test/testdata/escaping.carbon
+// TIP: To dump output, run:
+// TIP:   bazel run //testing/file_test:file_test_base_test -- --dump_output --file_tests=testing/file_test/testdata/escaping.carbon
+// CHECK:STDERR: carriage return{{\r}}
+// CHECK:STDERR: {one brace}
+// CHECK:STDERR: {{\{\{}}two braces}}
+// CHECK:STDERR: [one bracket]
+// CHECK:STDERR: {{\[\[}}two brackets]]
+// CHECK:STDERR: end of line whitespace   {{}}
+// CHECK:STDERR: {{\t}}tabs{{\t}}
+
+// CHECK:STDOUT: 2 args: `default_args`, `escaping.carbon`