Move InMemoryGitRepository to SPMTestSupport (#2996)

Author: mattt

Sources/SourceControl/InMemoryGitRepository.swift renamed to Sources/SPMTestSupport/InMemoryGitRepository.swift

@@ -9,8 +9,9 @@
 */
 
 import TSCBasic
-import Dispatch
 import TSCUtility
+import SourceControl
+import Dispatch
 import class Foundation.NSUUID
 
 /// The error encountered during in memory git repository operations.

Sources/SourceControl/CMakeLists.txt

@@ -8,7 +8,6 @@
 
 add_library(SourceControl
   GitRepository.swift
-  InMemoryGitRepository.swift
   Repository.swift
   RepositoryManager.swift
   SwiftPMConfig.swift)