Support Flame Graphs, Memory Reports for all GET requests in Performance Bar. Improve UI: Display Batched GraphQL operations, fix for small screens.

This issue was originally about all requests, including POSTs.
We split it into a separate issue: #407864

Under this issue, we delivered:

• ✅ Support for cpu/wall/object flamegraphs for any GET request executed on the page (from the dropdown), not only the initial one
• ✅ Support for memory stats report (link Stats) for any GET request executed on the page, not only the initial one. Similar to the previous item
• ✅ Smaller UI footprint to fit PerfBar into laptop screens
• ✅ Showing the amount of batched queries executed for a single request, for awareness (because such requests will perform more work)