Don't create duplicate deployments

What does this MR do?

When the API parameters for a deployment are the same as the last deployment no new deployment will be created. This prevents duplicate deployments if nothing changed. As such no hooks will be executed either, which prevents for example Slack notifications which don't add value.

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
• [-] Informed Infrastructure department of a default or new setting change, if applicable per definition of done