Merge button stays disabled until page is reloaded after all conditions for being allowed to merge are met

After resolving all merge request discussions, the merge button should be active immediately. I shouldn't need to reload the page.

Similarly, when getting Approval while being on the MR page, it needs to be reloaded to activate the button.

Links / references

https://docs.gitlab.com/ee/user/discussions/index.html#only-allow-merge-requests-to-be-merged-if-all-discussions-are-resolved