[clang][deps] Create separate unittest directory

This is an NFC change split from llvm#68645.

(cherry picked from commit c11976f)

Author: jansvoboda11

clang/unittests/Tooling/CMakeLists.txt

@@ -13,8 +13,6 @@ add_clang_unittest(ToolingTests
   CastExprTest.cpp
   CommentHandlerTest.cpp
   CompilationDatabaseTest.cpp
-  DependencyScannerTest.cpp
-  DependencyScanningCASFilesystemTest.cpp
   DiagnosticsYamlTest.cpp
   ExecutionTest.cpp
   FixItTest.cpp
@@ -25,6 +23,8 @@ add_clang_unittest(ToolingTests
   LookupTest.cpp
   QualTypeNamesTest.cpp
   RangeSelectorTest.cpp
+  DependencyScanning/DependencyScannerTest.cpp
+  DependencyScanning/DependencyScanningCASFilesystemTest.cpp
   RecursiveASTVisitorTests/Attr.cpp
   RecursiveASTVisitorTests/CallbacksLeaf.cpp
   RecursiveASTVisitorTests/CallbacksUnaryOperator.cpp

clang/unittests/Tooling/DependencyScannerTest.cpp renamed to clang/unittests/Tooling/DependencyScanning/DependencyScannerTest.cpp

@@ -1,4 +1,4 @@
-//===- unittest/Tooling/ToolingTest.cpp - Tooling unit tests --------------===//
+//===- DependencyScannerTest.cpp ------------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.