Run TFLite ConvertFunctionMetadataPass on FuncOp. (#8443)

This pass did not appear to be running and the tests that would have caught it were disabled.

Found while helping with https://github.com/google/iree/issues/8412

integrations/tensorflow/iree_tf_compiler/TFL/Passes.cpp

diff --git a/integrations/tensorflow/iree_tf_compiler/TFL/Passes.cpp b/integrations/tensorflow/iree_tf_compiler/TFL/Passes.cpp
index ed9a78a..1696f34 100644
--- a/integrations/tensorflow/iree_tf_compiler/TFL/Passes.cpp
+++ b/integrations/tensorflow/iree_tf_compiler/TFL/Passes.cpp
@@ -45,7 +45,7 @@
   //----------------------------------------------------------------------------
 
   pm.addPass(createConvertModuleMetadataPass());
-  pm.nest<ModuleOp>().addPass(createConvertFunctionMetadataPass());
+  pm.nest<FuncOp>().addPass(createConvertFunctionMetadataPass());
 
   //----------------------------------------------------------------------------
   // Convert all TFL ops to TOSA ops

integrations/tensorflow/iree_tf_compiler/TFL/test/import/BUILD

diff --git a/integrations/tensorflow/iree_tf_compiler/TFL/test/import/BUILD b/integrations/tensorflow/iree_tf_compiler/TFL/test/import/BUILD
index 65a378c..e21753b 100644
--- a/integrations/tensorflow/iree_tf_compiler/TFL/test/import/BUILD
+++ b/integrations/tensorflow/iree_tf_compiler/TFL/test/import/BUILD
@@ -23,12 +23,6 @@
         include = ["*.mlir"],
     ),
     data = glob(["*.tflite"]),
-    # TODO: These tests have never passed
-    tags = [
-        "manual",
-        "nokokoro",
-        "notap",
-    ],
     tools = [
         "//iree_tf_compiler:iree-import-tflite",
         "@llvm-project//llvm:FileCheck",

integrations/tensorflow/iree_tf_compiler/TFL/test/import/add.mlir

diff --git a/integrations/tensorflow/iree_tf_compiler/TFL/test/import/add.mlir b/integrations/tensorflow/iree_tf_compiler/TFL/test/import/add.mlir
index 2b563a0..c204c63 100644
--- a/integrations/tensorflow/iree_tf_compiler/TFL/test/import/add.mlir
+++ b/integrations/tensorflow/iree_tf_compiler/TFL/test/import/add.mlir
@@ -1,7 +1,7 @@
-// RUN: iree-import-tflite iree_tf_compiler/test/TFL/add.tflite | FileCheck %s
+// RUN: iree-import-tflite %S/add.tflite | FileCheck %s
 
 //      CHECK: module {
-// CHECK-NEXT:   func @main(%arg0: tensor<1x8x8x3xf32>) -> tensor<1x8x8x3xf32> attributes {tf.entry_function = {inputs = "input", outputs = "output"}} {
+// CHECK-NEXT:   func @main(%arg0: tensor<1x8x8x3xf32> {iree.identifier = "input"}) -> (tensor<1x8x8x3xf32> {iree.identifier = "output"}) {
 // CHECK-NEXT:     %0 = "tosa.add"(%arg0, %arg0) : (tensor<1x8x8x3xf32>, tensor<1x8x8x3xf32>) -> tensor<1x8x8x3xf32>
 // CHECK-NEXT:     %1 = "tosa.add"(%0, %arg0) : (tensor<1x8x8x3xf32>, tensor<1x8x8x3xf32>) -> tensor<1x8x8x3xf32>
 // CHECK-NEXT:     return %1 : tensor<1x8x8x3xf32>

integrations/tensorflow/iree_tf_compiler/TFL/test/import/multi_add.mlir

diff --git a/integrations/tensorflow/iree_tf_compiler/TFL/test/import/multi_add.mlir b/integrations/tensorflow/iree_tf_compiler/TFL/test/import/multi_add.mlir
index 6d8e283..8aa3845 100644
--- a/integrations/tensorflow/iree_tf_compiler/TFL/test/import/multi_add.mlir
+++ b/integrations/tensorflow/iree_tf_compiler/TFL/test/import/multi_add.mlir
@@ -1,7 +1,7 @@
-// RUN: iree-import-tflite iree_tf_compiler/test/TFL/multi_add.tflite | FileCheck %s
+// RUN: iree-import-tflite %S/multi_add.tflite | FileCheck %s
 
 //      CHECK: module {
-// CHECK-NEXT:   func @main(%arg0: tensor<1x8x8x3xf32>, %arg1: tensor<1x8x8x3xf32>, %arg2: tensor<1x8x8x3xf32>, %arg3: tensor<1x8x8x3xf32>) -> (tensor<1x8x8x3xf32>, tensor<1x8x8x3xf32>) attributes {tf.entry_function = {inputs = "a,b,c,d", outputs = "x,y"}} {
+// CHECK-NEXT:   func @main(%arg0: tensor<1x8x8x3xf32> {iree.identifier = "a"}, %arg1: tensor<1x8x8x3xf32> {iree.identifier = "b"}, %arg2: tensor<1x8x8x3xf32> {iree.identifier = "c"}, %arg3: tensor<1x8x8x3xf32> {iree.identifier = "d"}) -> (tensor<1x8x8x3xf32> {iree.identifier = "x"}, tensor<1x8x8x3xf32> {iree.identifier = "y"}) {
 // CHECK-NEXT:     %0 = "tosa.add"(%arg1, %arg2) : (tensor<1x8x8x3xf32>, tensor<1x8x8x3xf32>) -> tensor<1x8x8x3xf32>
 // CHECK-NEXT:     %1 = "tosa.add"(%arg0, %0) : (tensor<1x8x8x3xf32>, tensor<1x8x8x3xf32>) -> tensor<1x8x8x3xf32>
 // CHECK-NEXT:     %2 = "tosa.add"(%arg3, %0) : (tensor<1x8x8x3xf32>, tensor<1x8x8x3xf32>) -> tensor<1x8x8x3xf32>