Make activation factories not weak and reduce duplicate retrieval of activation factories

[manodasanW]

• We no longer store our activation factories as WeakLazy. We have seen some difference in traces in GC and COM time after this.
• Reduce the # of times we retrieve the activation factory for a type by sharing it among the statics and factories. This also led to us not loading the activation factory when we don't need it as in some cases it was a static variable in the class which would get initialized even for FromABI. This change avoids that happening.
• Move the static instances of the factories into the factory class to avoid initializing it until needed.
• Fixed scenario where we might not be correctly handling non agile activation factories by making it go through our free threaded check for ObjectReferenceWithContext code path.