Update platform defaults to return a launcher instead of a string

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

Tools/LyTestTools/ly_test_tools/launchers/launcher_helper.py

@@ -9,14 +9,15 @@ Main launchers module, provides a facade for creating launchers.
 
 import logging
 
-import ly_test_tools._internal.managers.workspace
 import ly_test_tools
+import ly_test_tools._internal.managers.workspace as workspace_manager
+import ly_test_tools.launchers.platforms.base as base_launcher
 
 log = logging.getLogger(__name__)
 
 
 def create_launcher(workspace, launcher_platform=ly_test_tools.HOST_OS_PLATFORM, args=None):
-    # type: (ly_test_tools.managers.workspace.WorkspaceManager, str, List[str]) -> Launcher
+    # type: (workspace_manager.AbstractWorkspaceManager, str, list[str]) -> base_launcher.Launcher
     """
     Create a launcher compatible with the specified workspace, if no specific launcher is found return a generic one.
 
@@ -25,12 +26,16 @@ def create_launcher(workspace, launcher_platform=ly_test_tools.HOST_OS_PLATFORM,
     :param args: List of arguments to pass to the launcher's 'args' argument during construction
     :return: Launcher instance
     """
-    launcher_class = ly_test_tools.LAUNCHERS.get(launcher_platform, ly_test_tools.HOST_OS_PLATFORM)
+    launcher_class = ly_test_tools.LAUNCHERS.get(launcher_platform)
+    if not launcher_class:
+        log.warning(f"Using default launcher for '{ly_test_tools.HOST_OS_PLATFORM}' "
+                    f"as no option is available for '{launcher_platform}'")
+        launcher_class = ly_test_tools.LAUNCHERS.get(ly_test_tools.HOST_OS_PLATFORM)
     return launcher_class(workspace, args)
 
 
 def create_dedicated_launcher(workspace, launcher_platform=ly_test_tools.HOST_OS_DEDICATED_SERVER, args=None):
-    # type: (ly_test_tools.managers.workspace.WorkspaceManager, str, List[str]) -> Launcher
+    # type: (workspace_manager.AbstractWorkspaceManager, str, list[str]) -> base_launcher.Launcher
     """
     Create a dedicated launcher compatible with the specified workspace.  Dedicated Launcher is only supported on the
     Linux and Windows Platform
@@ -41,11 +46,15 @@ def create_dedicated_launcher(workspace, launcher_platform=ly_test_tools.HOST_OS
     :return: Launcher instance
     """
     launcher_class = ly_test_tools.LAUNCHERS.get(launcher_platform, ly_test_tools.HOST_OS_DEDICATED_SERVER)
+    if not launcher_class:
+        log.warning(f"Using default dedicated launcher for '{ly_test_tools.HOST_OS_PLATFORM}' "
+                    f"as no option is available for '{launcher_platform}'")
+        launcher_class = ly_test_tools.LAUNCHERS.get(ly_test_tools.HOST_OS_DEDICATED_SERVER)
     return launcher_class(workspace, args)
 
 
 def create_editor(workspace, launcher_platform=ly_test_tools.HOST_OS_EDITOR, args=None):
-    # type: (ly_test_tools.managers.workspace.WorkspaceManager, str, List[str]) -> Launcher
+    # type: (workspace_manager.AbstractWorkspaceManager, str, list[str]) -> base_launcher.Launcher
     """
     Create an Editor compatible with the specified workspace.
     Editor is only officially supported on the Windows Platform.
@@ -56,11 +65,15 @@ def create_editor(workspace, launcher_platform=ly_test_tools.HOST_OS_EDITOR, arg
     :return: Editor instance
     """
     launcher_class = ly_test_tools.LAUNCHERS.get(launcher_platform, ly_test_tools.HOST_OS_EDITOR)
+    if not launcher_class:
+        log.warning(f"Using default editor launcher for '{ly_test_tools.HOST_OS_PLATFORM}' "
+                    f"as no option is available for '{launcher_platform}'")
+        launcher_class = ly_test_tools.LAUNCHERS.get(ly_test_tools.HOST_OS_EDITOR)
     return launcher_class(workspace, args)
 
 
 def create_generic_launcher(workspace, launcher_platform, exe_file_name, args=None):
-    # type: (ly_test_tools.managers.workspace.WorkspaceManager, str, str, List[str]) -> Launcher
+    # type: (workspace_manager.AbstractWorkspaceManager, str, str, list[str]) -> base_launcher.Launcher
     """
     Create a generic launcher compatible with the specified workspace.
     Allows custom .exe files to serve as the launcher instead of ones listed in the ly_test_tools.LAUNCHERS constant
@@ -72,4 +85,8 @@ def create_generic_launcher(workspace, launcher_platform, exe_file_name, args=No
     :return: Launcher instance.
     """
     launcher_class = ly_test_tools.LAUNCHERS.get(launcher_platform, ly_test_tools.HOST_OS_GENERIC_EXECUTABLE)
+    if not launcher_class:
+        log.warning(f"Using default generic executable launcher for '{ly_test_tools.HOST_OS_PLATFORM}' "
+                    f"as no option is available for '{launcher_platform}'")
+        launcher_class = ly_test_tools.LAUNCHERS.get(ly_test_tools.HOST_OS_GENERIC_EXECUTABLE)
     return launcher_class(workspace, exe_file_name, args)