Make TRT EP fully support control flow op and its subgraphs (#12692)
* sync graph proto in node's attributes
* Don't fuse nodes of control flow op until later in control flow op level
* remove unnecessary ep funtions
* remove unnecessary ep funtions
* remove unnecessary ep funtions
* missing 'override' keyword which makes MacOS/Web CI fail
* Add one more test run for Test3LayerNestedSubgraph with disabling graph optimization
* Update the comments to better understand the 4 cases