feat: ability to clear data older than X date, fix DB constraint errors for span.id from datasets to projects (#3670)

* WIP

* WIP

* Fix the DB

* more fixes

* switch to 1 month

* rename form

* rename to remove data

* Update src/phoenix/server/api/mutations/project_mutations.py

Co-authored-by: Roger Yang <80478925+RogerHYang@users.noreply.github.com>

* comments

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Co-authored-by: Roger Yang <80478925+RogerHYang@users.noreply.github.com>