Fix `AttributeError: 'CrateCompilerSA20' object

[bgunebakan]

Summary of the changes / Why this is an improvement

Moves visit_on_conflict_do_update and _on_conflict_target from CrateTypeCompiler to CrateCompiler. This is a bug fix for a misplaced method introduced in GH-264.

Checklist

• Link to issue this PR refers to (if applicable): Fixes #???
• Added tests

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[amotl]

Thank you so much for adding test cases.

[amotl]

@kneth: Can you also acknowledge so we can bring this in? 🙏