Fix the bug that the project statistics is not updated

What does this MR do?

Fix the bug that the project statistics is not updated.

Right now, the statistics are not updated in response to a push (or other kind of change) if they were already updated in the last 15 minutes, to prevent excessive load from these somewhat expensive updates.

This MR modifies this behavior to make sure that if any changes are made within this 15 minute window, the statistics are not updated immediately, but after the 15 minutes have expired, so the statistics are eventually accurate/up to date.

What are the relevant issue numbers?

#29288 (moved) #43765 (closed) #44726 (closed) #57640 (closed)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated via this MR
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• Security reports checked/validated by reviewer