Relabel the existing tooltips for the "Thread will be open" and "Thread stays open" buttons

What does this MR do and why?

Relabel the existing tooltips for the "Thread will be open" and "Thread stays open" buttons as mentioned here: #571918

1. "Thread will be open" -> Reopen the thread Reopen thread
2. "Thread stays open" -> Close the thread Resolve thread

References

Related to Tooltips to resolve a thread in a review is unc... (#571918)

Screenshots or screen recordings

Before	After

How to set up and validate locally

MR acceptance checklist

Evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.