Connect Adding and Removal of Gem Repo UI to CLI (#4729)

* Connect Adding and Removal of Gem Repo UI to CLI

Signed-off-by: nggieber <nggieber@amazon.com>

* Addressed PR feedback

Signed-off-by: nggieber <nggieber@amazon.com>

Code/Tools/ProjectManager/Source/PythonBindings.h

@@ -58,7 +58,8 @@ namespace O3DE::ProjectManager
         AZ::Outcome<QVector<ProjectTemplateInfo>> GetProjectTemplates(const QString& projectPath = {}) override;
 
         // Gem Repos
-        AZ::Outcome<void, AZStd::string> AddGemRepo(const QString& repoUri) override;
+        bool AddGemRepo(const QString& repoUri) override;
+        bool RemoveGemRepo(const QString& repoUri) override;
         AZ::Outcome<QVector<GemRepoInfo>, AZStd::string> GetAllGemRepoInfos() override;
 
     private: