On retrieving github CODEOWNERS resolve team names in rules to match team name without organization.

[cbart]

This was raised by @sashaostrikov.

Using search filter given @sourcegraph/code-insights-backend team used in a CODEOWNERS rule.

• file:has.owners(@sourcegraph/code-insights-backend) works because it matches what is literally in the codeowners file
• file:has.owners(code-insights-backend) does not work - but for results in sourcegraph org it should be matching the codeowners entry.

We can do this by having the Ruleset be repo-aware. So that when we're matching the search input, ruleset can consider code-insights-backend be matching this rule because of the context.

[cbart]

Search ownership filter code lives here: https://sourcegraph.com/github.com/sourcegraph/sourcegraph@c928f0a45774d233339beacae086ac08ef16fb54/-/blob/enterprise/internal/own/search/filter_job.go?L116-148