refactor(core): remove RepoDB as a dependency

[AngelMunoz]

• Replace RepoDb dependency with direct ADO.NET commands.

[Copilot]

Pull Request Overview

This PR refactors the core database layer by removing the RepoDB dependency and replacing it with direct ADO.NET commands. Key changes include:

• Removing RepoDB package references and corresponding open statements.
• Refactoring both synchronous and asynchronous tests to execute ADO.NET commands explicitly.
• Updating the getConnection API signature to return a DbConnection, enhancing type specificity.

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

File	Description
src/Migrondi.Tests/Database.fs	Removed RepoDB imports; refactored insertion and query methods using ADO.NET commands.
src/Migrondi.Tests/Database.Async.fs	Updated async test routines to use ADO.NET commands and adjusted assertions accordingly.
src/Migrondi.Core/Migrondi.Core.fsproj	Removed obsolete RepoDB package references; added direct ADO.NET driver packages.
src/Migrondi.Core/Database.fsi	Changed the getConnection signature to return DbConnection instead of IDbConnection.

Comments suppressed due to low confidence (3)

src/Migrondi.Tests/Database.fs:88

• Consider wrapping the transaction.Commit() call in a try/finally or try/with block to ensure that the transaction can be rolled back if an error occurs during the insertion loop.

transaction.Commit()

src/Migrondi.Core/Database.fsi:141

• Changing the getConnection return type from IDbConnection to DbConnection improves type safety; please verify that all consuming code seamlessly works with this change.

val getConnection: connectionString: string * driver: MigrondiDriver -> DbConnection

src/Migrondi.Tests/Database.Async.fs:392

• Ensure that the new expected ordering for rolledBackMigrations aligns with the intended migration rollback logic and is thoroughly documented in the tests.

Assert.AreEqual<string>("test_4", rolledBackMigrations[0].name)