VcsCommand: Conform to QtcProcess API

Add result() getter and done() signal in order to
conform to QtcProcess API.

Change-Id: Idc7c57e03d6e8acead9d4c034f4efc56250f944d
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>

src/plugins/vcsbase/vcscommand.h

@@ -118,11 +118,13 @@ public:
 
     QString cleanedStdOut() const;
     QString cleanedStdErr() const;
+    Utils::ProcessResult result() const;
 
 signals:
     void stdOutText(const QString &);
     void stdErrText(const QString &);
     void finished(bool success);
+    void done();
 
     void terminate(); // Internal