Fix merge requests stuck in checking state

What does this MR do?

We've added a new state called `cannot_be_merged_rechecking' in !28498 (merged), but it didn't get added to the list of merge_statuses to allow the merge request to be rechecked.


Does this MR meet the acceptance criteria?


Availability and Testing


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 #215109 (closed)

Edited by 🤖 GitLab Bot 🤖

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