[Tune] Fix max len trial name (#15293)
[Tune] Fix max len trial name (#15293)

* check TUNE_MAX_LEN_IDENTIFIER when use it

* fix format
pcmoritz/ray-1,pcmoritz/ray-1,pcmoritz/ray-1,pcmoritz/ray-1,ray-project/ray,ray-project/ray,ray-project/ray,ray-project/ray,ray-project/ray,pcmoritz/ray-1,pcmoritz/ray-1,ray-project/ray,ray-project/ray,pcmoritz/ray-1,pcmoritz/ray-1,ray-project/ray