refactor(core): removed redundant fields

[sohamm20]

Fixed #8468

Type of Change

• Bugfix
• New feature
• Enhancement
• Refactoring
• Dependency updates
• Documentation
• CI/CD

Description

Removed three redundant boolean fields (payment_created_enabled, payment_succeeded_enabled, payment_failed_enabled) from the WebhookDetails struct across API models, database models, and transformers. These fields were unused in backend flows and have been replaced by the more granular payment_statuses_enabled field that allows fine-grained control over which specific payment statuses trigger webhooks.

Additional Changes

• This PR modifies the API contract
• This PR modifies the database schema
• This PR modifies application configuration/environment variables

Motivation and Context

How did you test it?

Checklist

• I formatted the code cargo +nightly fmt --all
• I addressed lints thrown by cargo clippy
• I reviewed the submitted code
• I added unit tests for my changes where possible

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Changed Files

File	Status
crates/api_models/src/admin.rs	0% smaller
crates/diesel_models/src/business_profile.rs	0% smaller
crates/router/src/db/events.rs	0% smaller
crates/router/src/types/transformers.rs	0% smaller