Spec test coverage report hack (#13718)

* Spec test report hack

* no export

* fix shell complaint

* shell fix?

* shell again?

* chmod +x ./hack/spectest-report.sh

* Review + improvements

* Remove unwanted change

* Add exclusion list

* Fix path + add eip6110 to exclusion

* Fix bazel path nonsense

* Add extra detail about specific test

* Cleanup exclusion list

* Add fail conditions

* Add mkdir

* Shorten filename + mkdir only if new

* Fix names

* Add to exclusion list

* Add report to .gitignore

* Back to stupid names

* Add Bazel flags option

---------

Co-authored-by: Preston Van Loon <pvanloon@offchainlabs.com>

testing/spectest/utils/BUILD.bazel

@@ -11,6 +11,7 @@ go_library(
     visibility = ["//testing/spectest:__subpackages__"],
     deps = [
         "//config/params:go_default_library",
+        "//io/file:go_default_library",
         "//testing/require:go_default_library",
         "@com_github_ghodss_yaml//:go_default_library",
         "@com_github_json_iterator_go//:go_default_library",