sqlproxyccl: remove unused denylist implementations

The viper and mock denylist formats are no longer used as of #66137. I'm refactoring
the denylist for issue #65694. Removing the unused format simplifies the refactoring.

Release note: None

go.mod

@@ -152,7 +152,6 @@ require (
 	github.com/shopspring/decimal v1.2.0 // indirect
 	github.com/spf13/cobra v1.1.3
 	github.com/spf13/pflag v1.0.5
-	github.com/spf13/viper v1.7.1
 	github.com/stretchr/testify v1.6.1
 	github.com/twpayne/go-geom v1.3.7-0.20210228220813-9d9885b50d3e
 	github.com/wadey/gocovmerge v0.0.0-20160331181800-b5bfa59ec0ad

pkg/ccl/sqlproxyccl/denylist/BUILD.bazel

@@ -1,4 +1,3 @@
-load("@bazel_gomock//:gomock.bzl", "gomock")
 load("@io_bazel_rules_go//go:def.bzl", "go_library", "go_test")
 
 # gazelle:exclude service.go
@@ -12,32 +11,22 @@ go_library(
 
 go_library(
     name = "denylist",
-    srcs = [
-        "file.go",
-        "local_file.go",
-        ":mocks_denylist",  # keep
-    ],
+    srcs = ["file.go"],
     embed = [":service"],  # keep
     importpath = "github.com/cockroachdb/cockroach/pkg/ccl/sqlproxyccl/denylist",
     visibility = ["//visibility:public"],
     deps = [
-        "//pkg/util",
         "//pkg/util/log",
         "//pkg/util/syncutil",
         "//pkg/util/timeutil",
-        "@com_github_cockroachdb_errors//:errors",
         "@com_github_golang_mock//gomock",  # keep
-        "@com_github_spf13_viper//:viper",
         "@in_gopkg_yaml_v2//:yaml_v2",
     ],
 )
 
 go_test(
     name = "denylist_test",
-    srcs = [
-        "file_test.go",
-        "local_file_test.go",
-    ],
+    srcs = ["file_test.go"],
     embed = [":denylist"],
     deps = [
         "//pkg/util/leaktest",
@@ -46,12 +35,3 @@ go_test(
         "@in_gopkg_yaml_v2//:yaml_v2",
     ],
 )
-
-gomock(
-    name = "mocks_denylist",
-    out = "mocks_generated.go",
-    interfaces = ["Service"],
-    library = ":service",
-    package = "denylist",
-    self_package = "github.com/cockroachdb/cockroach/pkg/ccl/sqlproxyccl/denylist",
-)

pkg/ccl/sqlproxyccl/denylist/service.go

@@ -10,8 +10,6 @@ package denylist
 
 import "strings"
 
-//go:generate mockgen -package=denylist -destination=mocks_generated.go -source=service.go . Service
-
 // Entry records the reason for putting an item on the denylist.
 // TODO(spaskob): add codes for different denial reasons.
 type Entry struct {