Fix CockroachDB primary key: use unique_rowid() instead of SERIAL

[bpamiri]

Summary

• CockroachDBMigrator inherits PostgreSQL's addPrimaryKeyOptions() which replaces INTEGER with SERIAL -- a type CockroachDB does not support
• Adds an override in CockroachDBMigrator.cfc that uses INT DEFAULT unique_rowid() instead, which is CockroachDB's idiomatic auto-generated primary key pattern

Fixes #1970

Test plan

• Run migrations against a CockroachDB instance and verify CREATE TABLE statements use INT DEFAULT unique_rowid() PRIMARY KEY instead of SERIAL PRIMARY KEY
• Verify PostgreSQL migrations are unaffected (still use SERIAL)

🤖 Generated with Claude Code

[github-actions]

Wheels Test Matrix

Engine	MySQL	PostgreSQL	SQL Server	H2	Oracle	SQLite
lucee5	✅	✅	✅	✅	✅	✅
lucee6	✅	✅	✅	✅	✅	✅
lucee7	✅	✅	✅	✅	✅	✅
adobe2018	✅	✅	✅	--	✅	--
adobe2021	✅	✅	✅	--	✅	✅
adobe2023	✅	✅	✅	--	✅	✅
adobe2025	✅	✅	✅	--	✅	✅
boxlang	✅	✅	✅	--	✅	✅

Results for commit e44210c.

[github-actions]

Wheels Test Results

    42 files  ±0   3 906 suites  ±0   25m 12s ⏱️ -24s
79 512 tests ±0  79 124 ✅ ±0  388 💤 ±0  0 ❌ ±0 
82 158 runs  ±0  81 770 ✅ ±0  388 💤 ±0  0 ❌ ±0 

Results for commit 5bbe585. ± Comparison against base commit e57ecf8.