Fix quoting issue for defaultValue in migrations

[LiteracyFanatic]

Proposed Changes

• Add test for defaultValue in migrations being incorrectly quoted
• Only call code.UnknownLiteral once on an input

Types of changes

What types of changes does your code introduce to EFCore.FSharp? Put an x in the boxes that apply

• [x] Bugfix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code.

• [x] Build and tests pass locally
• [x] I have added tests that prove my fix is effective or that my feature works (if appropriate)
• [ ] I have added necessary documentation (if appropriate)

[simon-reynolds]

Thanks @LiteracyFanatic