Fix TEXT columns in primary keys causing MySQL error

MySQL doesn't allow TEXT/BLOB columns in primary keys without a key length.
When bot_id_type='text' or probeset_type='text' is specified, the column
type changes to TEXT but was still marked as primary_key=True, causing:
  OperationalError: (1170, "BLOB/TEXT column 'data_bot_id' used in key
  specification without a key length")

Changes:
- In _simple_schema(), when probeset_type='text', set primary_key=False
- In _simple_schema(), when bot_id_type='text', set primary_key=False
- Ensures data_signal remains a primary key for all databases

Affected databases (11 total):
- affydb, canola, canola_original, canola_seed
- hnahal, human, humandb
- meristemdb, rohan, rpatel, tomato_atlas

All 58 tests pass with 5,643 subtests.

Author: rmobmina

api/models/efp_schemas.py

@@ -173,13 +173,19 @@ def _simple_schema(
         if "probeset_type" in kwargs:
             probeset_type = kwargs.pop("probeset_type")
             overrides["data_probeset_id"] = {"type": probeset_type, "length": None}
+            # TEXT columns cannot be primary keys in MySQL
+            if probeset_type == "text":
+                overrides["data_probeset_id"]["primary_key"] = False
         else:
             overrides["data_probeset_id"] = {"length": probeset_len}
 
         # Handle data_bot_id
         if "bot_id_type" in kwargs:
             bot_id_type = kwargs.pop("bot_id_type")
             overrides["data_bot_id"] = {"type": bot_id_type, "length": None}
+            # TEXT columns cannot be primary keys in MySQL
+            if bot_id_type == "text":
+                overrides["data_bot_id"]["primary_key"] = False
         else:
             overrides["data_bot_id"] = {"length": bot_id_len}