Fix GQA Rotary Embedding sequence length (#19801)
### Description
Previously, GQA incorrectly enforced rotary cos and sin cache to be of
sequence length equal to present sequence length. Now it enforces that
it be greater than or equal to present sequence length since to match
Rotary Embedding Op it should be of max_sequence_length
### Motivation and Context
Fixes issue with fusing Rotary Embedding and GQA for certain models
which prefer this optimization.
