Swift: add a query showing successfully extracted files

(cherry picked from commit 7c15527300)

swift/ql/src/diagnostics/SuccessfullyExtractedFiles.ql

@@ -0,0 +1,15 @@
+/**
+ * @name Successfully extracted files
+ * @description Lists all files in the source code directory that were extracted without encountering a problem in the file.
+ * @kind diagnostic
+ * @id swift/diagnostics/successfully-extracted-files
+ * @tags successfully-extracted-files
+ */
+
+import swift
+
+from File f
+where
+  not exists(CompilerError e | e.getFile() = f) and
+  f.getBaseName().regexpMatch(".*\\.swift\\z")
+select f, "File successfully extracted."

swift/ql/test/query-tests/Diagnostics/SuccessfullyExtractedFiles.expected

@@ -0,0 +1 @@
+| main.swift:0:0:0:0 | main.swift | File successfully extracted. |

swift/ql/test/query-tests/Diagnostics/SuccessfullyExtractedFiles.qlref

@@ -0,0 +1 @@
+diagnostics/SuccessfullyExtractedFiles.ql

swift/ql/test/query-tests/Diagnostics/error.swift

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+//codeql-extractor-expected-status: 1
+#error("Uh oh")