In dynamo tracing for index() use None as the default indicator for end and not -1 (#119151)
Summary: In dynamo tracing, `index()`'s implementation currently has the default begin index as `0` and the default end index as`-1` which means that by default we're dropping the last element. Rather we should be doing `None` which will ensure that the last element is also checked.
Test Plan: CI
Differential Revision: D53392287
Pull Request resolved: https://github.com/pytorch/pytorch/pull/119151
Approved by: https://github.com/yanboliang
