feat: trace delete route by relay id (#8863)

* feat: trace delete by relay id as well

* schema

* ruff

* Update schemas/openapi.json

Co-authored-by: Xander Song <axiomofjoy@gmail.com>

* Update src/phoenix/server/api/routers/v1/traces.py

Co-authored-by: Xander Song <axiomofjoy@gmail.com>

* update description

* resolve comments

* cleanup

* schema

* fix route param name

* fix route param description

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Co-authored-by: Xander Song <axiomofjoy@gmail.com>