feat(database): add update-many capability

[KilianBoute]

Description

This change adds first-class support for multi-document updates through a new MultiUpdater capability and UpdateMany implementation for both the MongoDB client and the testing mocks.

The main motivation is to support bulk update workflows without forcing consumers to loop over individual UpdateOne calls. Exposing UpdateMany directly improves efficiency, aligns the abstraction layer with MongoDB’s native capabilities, and simplifies application code that needs to modify multiple matching documents atomically.

The PR also improves consistency across the database package:

• MongoClient now supports UpdateMany using the same option handling as UpdateOne.
• Shared updateOptions logic removes duplicated option parsing and ensures both update paths behave identically.
• MockDatabase now fully supports UpdateMany, including queued responses, call tracking, expectations, and reset handling, making integration and unit tests easier to write and more reliable.

Comprehensive tests were added to verify option filtering, result propagation, error handling, and mock state management.

[codecov]

Codecov Report

❌ Patch coverage is 68.85246% with 19 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
pkg/database/mock.go	75.00%	11 Missing and 1 partial ⚠️
pkg/database/mongodb.go	46.15%	7 Missing ⚠️

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