Decouple Webhooks from Integrations within Project > Settings

What does this MR do?

Issue #119429 (closed)

This MR extracts the Webhooks section within Project > Settings > Integrations to its own section Project > Settings > Webhooks

• Extract route, controllers, views
• Minor changes to make views more consistent and coherent
• Polish to UI, copy, navbar elements
• The last commit !23136 (86f0f899) is to add an alert notifying users that the section has moved as described in this #202167 (closed)

Screenshots

Settings > Integrations

Settings > Webhooks

Settings > Webhooks > Edit

Without logs With logs

Settings > Webhooks > Webhook Logs

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team