* merge matmul and add
* modify format
* using paddle.nn.functional.linear
* using _C_ops.linear
* using paddle.nn.functional.linear
* add FLAGS_use_legacy_linear env var in test case
* fix format
* add assert and remove env
* modify format
* using matmul for no bias
* modify accurate baseline
* cherry-pick Support Fully Async and PrefixCache step 1
* copy routing_indices_cache.py from 2.4
* cherry-pick [RL] R3 Fix the bug for determining the end of a request (#6388)
* cherry-pick [RL] Clear Requests status of R3 (#6569)
* delete code
* fix rename bug
* fix status shape bug
* fix ci