VcsBase: Cleanup some Utils:: in cpp files

We are using namespace Utils in these files.

Change-Id: I0526f7e4fff2fe0d24d1e2b9fa087298d5331955
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>

src/plugins/vcsbase/vcsoutputformatter.cpp

@@ -49,8 +49,7 @@ VcsOutputLineParser::VcsOutputLineParser() :
 {
 }
 
-Utils::OutputLineParser::Result VcsOutputLineParser::handleLine(const QString &text,
-                                                                Utils::OutputFormat format)
+OutputLineParser::Result VcsOutputLineParser::handleLine(const QString &text, OutputFormat format)
 {
     Q_UNUSED(format);
     QRegularExpressionMatchIterator it = m_regexp.globalMatch(text);