Fix shared type entity type name generation in model snapshot

[AndriySvyryd]

Fixes #36180

[Copilot]

Pull request overview

Fixes snapshot generation for owned entity types with shared CLR types so that regenerating a model snapshot from a model that was itself built from a snapshot (e.g., during Remove-Migration) doesn’t produce corrupted owned type names in HasForeignKey(...) calls (Issue #36180).

Changes:

• Adjust CSharpSnapshotGenerator.GetFullName to better normalize owned entity type names when HasSharedClrType is true (including handling names derived from ShortName()).
• Add a regression test covering an owned collection containing a one-to-one reference, verifying snapshot round-tripping stability and successful compilation.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
test/EFCore.Design.Tests/Migrations/Design/CSharpMigrationsGeneratorTest.ModelSnapshot.cs	Adds a regression test to ensure snapshot regeneration doesn’t corrupt owned type names for one-to-one relationships inside owned collections.
src/EFCore.Design/Migrations/Design/CSharpSnapshotGenerator.cs	Updates owned entity type name normalization logic for shared CLR types to prevent duplicated/incorrect owned type names in generated snapshots.