Performance: Investigate large amounts of `GitBlame` requests when navigating search results (Spike)

[umpox]

Description

Goal: Reduce CPU load and any UX blockers that depend on this request being resolved
Reason:

• We don't seem to actually render this information, needs more investigation as to why we make these requests
• There is quite a lot, and the CPU performance on the search page is already quite low.

Note: Potentially affected by wg-sunset-sg-extensions (Slack channel)

A/C

• Reduce or stop making GitBlame requests if not required.

[sourcegraph-bot-2]

Heads up @taylorsperry @jasongornall - the "team/frontend-platform" label was applied to this issue.