Fix: Supporting Database Strategies with Credentials Provider

[yuito-it]

Fix: Supporting Database Strategies with Credentials Provider

☕️ Reasoning

EN

When using the Credentials Provider with a database strategy, sessions were not being persisted and authentication did not work as expected. This change updates the logic to properly store sessions in the database.

(I'm a Japanese student so I can't speak English well... Sorry...)

JA

Credentials Providerでは、Databaseを使うように指定している際に、セッションが保存されず、動作しませんでした。
そのため、DBにセッションを保存するように変更しました。

🧢 Checklist

• [x] Documentation
• [x] Tests
• [x] Ready to be merged

🎫 Affected issues

Resolves: #11088
Resolves: #10280

📌 Resources

• Security guidelines
• Contributing guidelines
• Code of conduct
• Contributing to Open Source

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