### Details:
- Initialization of OV Opset15
(Discussed internally and agreed to introduce new opset in 2024.2)
To provide more agile approach, this PR has been updated with an idea
(proposed by @mmikolajcz) to include only new operators within the new
Opset, and fill it up at the end of the development period (not
necessarily per release).
This should lead to infrequent introduction of further opsets.
\* Currently common opsets tests rely on Parameter/ShapeOf/Convert in
every opset, so they were added.
But this approach for opset testing should be revised.
### Tickets:
- 138268, 131683
* remove old api from python snippets and docs (#170)
* remove old api from python snippets
* pysnippets removal p2
* remove ngraph snippet
* remove old api from docs
* remove migration snippets
* remove from init
Katarzyna Mitrus