refactor: migrate Ginkgo v1 AfterEach cleanup to v2 DeferCleanup

Replace all AfterEach cleanup blocks with DeferCleanup calls co-located
in BeforeEach/JustBeforeEach, following Ginkgo v2 idioms. Bare AfterEach
at Describe-level are replaced with direct DeferCleanup calls in the
Describe body.

Author: ramonskie

src/staticfile/finalize/finalize_test.go

@@ -48,6 +48,13 @@ var _ = Describe("Compile", func() {
 
 		mockCtrl = gomock.NewController(GinkgoT())
 		mockYaml = NewMockYAML(mockCtrl)
+		DeferCleanup(func() {
+			err = os.RemoveAll(buildDir)
+			Expect(err).To(BeNil())
+
+			err = os.RemoveAll(depDir)
+			Expect(err).To(BeNil())
+		})
 	})
 
 	JustBeforeEach(func() {
@@ -60,16 +67,6 @@ var _ = Describe("Compile", func() {
 		}
 	})
 
-	AfterEach(func() {
-		mockCtrl.Finish()
-
-		err = os.RemoveAll(buildDir)
-		Expect(err).To(BeNil())
-
-		err = os.RemoveAll(depDir)
-		Expect(err).To(BeNil())
-	})
-
 	Describe("WriteStartupFiles", func() {
 		It("writes staticfile.sh to the profile.d directory", func() {
 			err = finalizer.WriteStartupFiles()
@@ -909,7 +906,7 @@ var _ = Describe("Compile", func() {
 			Expect(err).To(BeNil())
 		})
 
-		AfterEach(func() {
+		DeferCleanup(func() {
 			err = os.RemoveAll(appRootDir)
 			Expect(err).To(BeNil())
 		})

src/staticfile/supply/supply_test.go

@@ -48,6 +48,7 @@ var _ = Describe("Supply", func() {
 		mockCtrl = gomock.NewController(GinkgoT())
 		mockManifest = NewMockManifest(mockCtrl)
 		mockInstaller = NewMockInstaller(mockCtrl)
+		DeferCleanup(os.RemoveAll, depsDir)
 	})
 
 	JustBeforeEach(func() {
@@ -62,13 +63,6 @@ var _ = Describe("Supply", func() {
 		}
 	})
 
-	AfterEach(func() {
-		mockCtrl.Finish()
-
-		err = os.RemoveAll(depsDir)
-		Expect(err).To(BeNil())
-	})
-
 	Describe("InstallNginx", func() {
 		BeforeEach(func() {
 			dep := libbuildpack.Dependency{Name: "nginx", Version: "99.99"}