AutoTest: Speed up scanning for tests

Especially Qt and Quick tests scanning takes some time,
so do some additional pre-filtering of files before
parsing them to reduce the number of files to process.
Depending on the structure of the project this can
significantly reduce the scan time.

Task-number: QTCREATORBUG-29301
Change-Id: I629beedcc02502d98d84e29282e1cd7b265cfcf0
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: David Schulz <david.schulz@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>

src/plugins/autotest/itestparser.h

@@ -9,6 +9,8 @@
 #include <cppeditor/cppworkingcopy.h>
 #include <qmljs/qmljsdocument.h>
 
+#include <optional>
+
 QT_BEGIN_NAMESPACE
 template <class T>
 class QPromise;
@@ -76,6 +78,9 @@ public:
     static bool precompiledHeaderContains(const CPlusPlus::Snapshot &snapshot,
                                           const Utils::FilePath &filePath,
                                           const QRegularExpression &headerFileRegex);
+    // returns all files of the startup project whose ProjectPart has the given \a macroName
+    // set as a project define
+    static std::optional<QSet<Utils::FilePath>> filesContainingMacro(const QByteArray &macroName);
 
 protected:
     CPlusPlus::Snapshot m_cppSnapshot;