fix(database): harden insert contracts

[KilianBoute]

Description

This change hardens the database insert contracts by bringing InsertOne and InsertMany in line with the rest of the database abstraction layer.

Previously, insert operations ignored MongoDB-specific options and had limited support in the mock database implementation. That made insert behavior harder to validate in tests and increased the risk of production code diverging from test expectations.

This PR improves reliability in two key ways:

• MongoClient.InsertOne and InsertMany now correctly retain and forward supported MongoDB insert options while safely ignoring unrelated wrapper options. This makes insert behavior consistent with other database methods and ensures callers can rely on validation, ordering, comments, and other driver-level configuration being applied correctly.
• MockDatabase now fully supports insert expectations, queued responses, option tracking, and call inspection for both single and bulk inserts. This enables more precise tests around insert flows, sequential failures, retries, and option propagation.

The added test coverage validates both the option filtering logic and the new mock behaviors, reducing the likelihood of silent regressions in insert handling.

[codecov]

Codecov Report

❌ Patch coverage is 96.55172% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
pkg/database/mongodb.go	85.71%	2 Missing ⚠️

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