Constraint migration generations ignore prefixes

[cschmatzler]

Describe the bug
The AlterDeferrability operation does not respect schema prefixes, which results in broken migrations.

ash_postgres/lib/migration_generator/operation.ex

Line 429 in 459d853

"execute(\"ALTER TABLE #{table} alter CONSTRAINT #{name} DEFERRABLE INITIALLY IMMEDIATE\");"

To Reproduce

1. Create a resource with a prefix on data layer level. Generate migrations.
2. Create a resource that has a foreign key on table from #1. Generate migrations.
3. Change the name of table 1. Generate migrations.
4. The migration fails with "relation does not exist" because the prefix is missing.

Expected behavior
Prefix is added to the migration.

** Runtime

• Elixir version 1.16.2
• Erlang version 26.2.4
• OS macOS 14.4.1
• Ash version
  {:ash_postgres, "== 2.0.0-rc.15"}