Add "internal/charm" imports to allow list of core

Many tests began failing when we pulled "juju/charm" into "internal",
now that it exists in juju/juju

Fix tests

api/package_test.go

@@ -55,6 +55,10 @@ func (*ImportSuite) TestImports(c *gc.C) {
 		"domain/secret/errors",
 		"domain/secretbackend/errors",
 		"environs/envcontext",
+		"internal/charm",
+		"internal/charm/assumes",
+		"internal/charm/hooks",
+		"internal/charm/resource",
 		"internal/feature",
 		"internal/logger",
 		"internal/proxy",

cmd/containeragent/initialize/package_test.go

@@ -82,6 +82,10 @@ func (*importSuite) TestImports(c *gc.C) {
 		"environs/config",
 		"environs/envcontext",
 		"environs/tags",
+		"internal/charm",
+		"internal/charm/assumes",
+		"internal/charm/hooks",
+		"internal/charm/resource",
 		"internal/charmhub",
 		"internal/charmhub/path",
 		"internal/charmhub/transport",

core/base/package_test.go

@@ -27,6 +27,10 @@ func (*ImportTest) TestImports(c *gc.C) {
 	c.Assert(found, jc.SameContents, []string{
 		"core/logger",
 		"core/os/ostype",
+		"internal/charm",
+		"internal/charm/assumes",
+		"internal/charm/hooks",
+		"internal/charm/resource",
 		"internal/logger",
 	})
 }

core/migration/package_test.go

@@ -30,6 +30,7 @@ func (*ImportTest) TestImports(c *gc.C) {
 		"core/logger",
 		"core/network",
 		"core/resources",
+		"internal/charm/resource",
 		"internal/logger",
 	})
 }

core/settings/package_test.go

@@ -24,5 +24,12 @@ func (*importSuite) TestImports(c *gc.C) {
 	found := coretesting.FindJujuCoreImports(c, "github.com/juju/juju/core/settings")
 
 	// This package only brings in other core packages.
-	c.Assert(found, jc.SameContents, []string{})
+	c.Assert(found, jc.SameContents, []string{
+		"core/logger",
+		"internal/charm",
+		"internal/charm/assumes",
+		"internal/charm/hooks",
+		"internal/charm/resource",
+		"internal/logger",
+	})
 }

core/watcher/eventsource/package_test.go

@@ -44,6 +44,7 @@ func (*ImportTest) TestImports(c *gc.C) {
 		"core/secrets",
 		"core/status",
 		"core/watcher",
+		"internal/charm/resource",
 		"internal/logger",
 	})
 

core/watcher/package_test.go

@@ -32,6 +32,7 @@ func (s *ImportTest) TestImports(c *gc.C) {
 		"core/resources",
 		"core/secrets",
 		"core/status",
+		"internal/charm/resource",
 		"internal/logger",
 	})