Additional DB migrations needed for evaluation history switchover

[dmjb]

Adds:

• Lower case index to rule instance names - this is needed since we will need the ability to query rule names in a case insensitive manner (see migration 31)
• A "migrated" column to rule_evaluations. This will be used to figure out which entries in the rule_evaluations table need to be copied across to the evaluation_rule_entities table.

Summary

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Fixes #(related issue)

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• Bug fix (resolves an issue without affecting existing features)
• Feature (adds new functionality without breaking changes)
• Breaking change (may impact existing functionalities or require documentation updates)
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• Refactoring or test improvements (no bug fixes or new functionality)

Testing

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Review Checklist:

• Reviewed my own code for quality and clarity.
• Added comments to complex or tricky code sections.
• Updated any affected documentation.
• Included tests that validate the fix or feature.
• Checked that related changes are merged.

[coveralls]

coverage: 54.364% (-0.004%) from 54.368%
when pulling 3221c53 on more-eval-history-changes
into 9c9d058 on main.

[JAORMX]

Can you add ore context to both the title and PR description?