Tests: remove @testable import PackageCollections

Use the newly extended APIs for testing and use a non-testable import of
the package, avoiding a recompilation.

Author: compnerd

Tests/PackageCollectionsTests/GitHubPackageMetadataProviderTests.swift

@@ -14,7 +14,7 @@ import Foundation
 import XCTest
 
 import Basics
-@testable import PackageCollections
+import PackageCollections
 import PackageModel
 import SourceControl
 import _InternalTestSupport

Tests/PackageCollectionsTests/JSONPackageCollectionProviderTests.swift

@@ -14,7 +14,7 @@ import Foundation
 import XCTest
 
 import Basics
-@testable import PackageCollections
+import PackageCollections
 import PackageCollectionsSigning
 import PackageModel
 import SourceControl

Tests/PackageCollectionsTests/PackageCollectionSourceCertificatePolicyTests.swift

@@ -13,7 +13,7 @@
 import _InternalTestSupport
 import XCTest
 
-@testable import PackageCollections
+import PackageCollections
 import PackageCollectionsSigning
 
 final class PackageCollectionSourceCertificatePolicyTests: XCTestCase {

Tests/PackageCollectionsTests/PackageCollectionValidationTests.swift

@@ -13,7 +13,7 @@
 import Foundation
 import XCTest
 
-@testable import PackageCollections
+import PackageCollections
 @testable import PackageCollectionsModel
 import PackageModel
 

Tests/PackageCollectionsTests/PackageCollectionsModelTests.swift

@@ -11,7 +11,7 @@
 //===----------------------------------------------------------------------===//
 
 import Basics
-@testable import PackageCollections
+import PackageCollections
 import PackageModel
 import _InternalTestSupport
 import XCTest

Tests/PackageCollectionsTests/PackageCollectionsSourcesStorageTest.swift

@@ -11,7 +11,7 @@
 //===----------------------------------------------------------------------===//
 
 import Basics
-@testable import PackageCollections
+import PackageCollections
 import _InternalTestSupport
 import XCTest
 

Tests/PackageCollectionsTests/PackageCollectionsStorageTests.swift

@@ -11,7 +11,7 @@
 //===----------------------------------------------------------------------===//
 
 import Basics
-@testable import PackageCollections
+import PackageCollections
 import _InternalTestSupport
 import tsan_utils
 import XCTest

Tests/PackageCollectionsTests/PackageCollectionsTests.swift

@@ -15,7 +15,7 @@ import XCTest
 import _InternalTestSupport
 
 import Basics
-@testable import PackageCollections
+import PackageCollections
 import PackageModel
 import SourceControl
 

Tests/PackageCollectionsTests/PackageIndexAndCollectionsTests.swift

@@ -12,7 +12,7 @@
 
 import Basics
 import Foundation
-@testable import PackageCollections
+import PackageCollections
 import PackageModel
 import _InternalTestSupport
 import XCTest

Tests/PackageCollectionsTests/PackageIndexTests.swift

@@ -12,7 +12,7 @@
 
 import Basics
 import Foundation
-@testable import PackageCollections
+import PackageCollections
 import PackageModel
 import _InternalTestSupport
 import XCTest