fix(templates): correcting when we can patch in the templates

[Jacobbrewer1]

Describe your changes

This pull request makes significant updates to the patch functionality in the codebase, including the addition of a new Patch method and the removal of the old one. The changes enhance the way patches are generated and executed in the database.

Enhancements to patch functionality:

• templates/_update.tmpl: Removed the old Patch method, which handled patching by generating and executing SQL patches.
• templates/model.tmpl: Added a new Patch method that includes a {{ lcfirst $struct }}IdWherer type for generating the WHERE clause based on primary key columns. This method also uses the patcher.NewDiffSQLPatch function to create SQL patches.