InputBlockV2 - Extend test coverage

[gabrielspmoreira]

Currently there are dozens of tests using InputBlock.
This task is about creating copies of those tests and replacing InputBlock by InputBlockV2, which over time will be the de-facto solution for InputBlock and flexible embedding table definition.
Associated to RMP #479, which you can check for more context

[viswa-nvidia]

@marcromeyn , please review this ticket and break it up so that session based models are prioritized for 22.09 and the rest are kept in needs prioritization.

[viswa-nvidia]

@marcromeyn , please tag the PR and close it