Re-enabled linux tests physics (#5701)

* Re-enabled linux tests physics

* Fix for python load errors on Linux (#5627)

* Explicitly load libpython on Linux

Downstream loads of python modules that weren't linked to libpython would
fail to load because libraries were loaded using the RTLD_LOCAL flag.  This
adds a function that will explicitly load libpython on Linux using the
RTLD_GLOBAL flag.

Signed-off-by: amzn-phist <52085794+amzn-phist@users.noreply.github.com>

* Fix misspelled function name

Signed-off-by: amzn-phist <52085794+amzn-phist@users.noreply.github.com>

* Addressing PR feedback

- Updates naming and location of things.
- Adds load code to a Gem template.
- Updates error checking.

Signed-off-by: amzn-phist <52085794+amzn-phist@users.noreply.github.com>

* Address further feedback

Removes the api function in favor of just having modules inherit off a
PythonLoader class, that way we get RAAI behavior and lifetime management
for free.

Signed-off-by: amzn-phist <52085794+amzn-phist@users.noreply.github.com>
Signed-off-by: aljanru <aljanru@amazon.co.uk>

Co-authored-by: amzn-phist <52085794+amzn-phist@users.noreply.github.com>

Code/Framework/AzToolsFramework/AzToolsFramework/API/PythonLoader.h

@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) Contributors to the Open 3D Engine Project.
+ * For complete copyright and license terms please see the LICENSE at the root of this distribution.
+ *
+ * SPDX-License-Identifier: Apache-2.0 OR MIT
+ *
+ */
+
+#pragma once
+
+namespace AzToolsFramework::EmbeddedPython
+{
+    // When using embedded Python, some platforms need to explicitly load the python library.
+    // For any modules that depend on 3rdParty::Python package, the AZ::Module should inherit this class.
+    class PythonLoader
+    {
+    public:
+        PythonLoader();
+        ~PythonLoader();
+
+    private:
+        void* m_embeddedLibPythonHandle{ nullptr };
+    };
+
+} // namespace AzToolsFramework::EmbeddedPython