[resource-manager]: Make default LRO Options for RPaaS services more explicit

[markcowl]

Add documentation, samples, and perhaps operation aliases for preferred LRO Options for RPaaS operations.

Currently, the default templates are using some older patterns (like location header), and we should
(1) Have clear documentation on which templates to use
(2) Have an RPaaS LRO sample that demonstrates appropriate usage
(3) Consider template aliases for RPaaS LROs that use RPaaS recommended options