Add re2 dep back to Bazel build (#5721)

This explicit dep was removed in #5707 but it is still used by the test
library. Not sure why the Bazel build didn't catch the indirect
dependence on another module but it is causing build failures
downstream.

BUILD.bazel

@@ -499,6 +499,7 @@ cc_library(
         ":spirv_tools_link",
         ":test_lib",
         "@effcee//:effcee",
+        "@re2//:re2",
     ],
 )
 

MODULE.bazel

@@ -6,6 +6,12 @@ local_path_override(
     path = "external/googletest",
 )
 
+bazel_dep(name = "re2", dev_dependency = True)
+local_path_override(
+    module_name = "re2",
+    path = "external/re2",
+)
+
 bazel_dep(name = "effcee", dev_dependency = True)
 local_path_override(
     module_name = "effcee",