Rename project delete "adjourned" and "soft deleted" as "delayed"

What does this MR do?

This MR updates the wording for "soft delete" in the documentation and textual references in the codebase. #223013 (closed)

Phrases changed:

• "soft delete" to "delayed delete".
• "adjourned" to "delayed".
• "adjournment period" to "delay".

Non-text codebase (API endpoints, methods etc) changes will be completed with #234090

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

Check the documentation locally at [GDK_HOST]/help/[PATH_TO_DOC] and check the templates show the correct text.

• 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

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

Closes #223013 (closed)