Reduce redundant Dag team lookups in authorization checks

[yuseok89]

closes: #61485

requires_access_dag resolves a Dag's owning team via DagModel.get_team_name on every call — twice per grid endpoint (TASK_INSTANCE + RUN) and on every auto-refresh poll.

This caches the lookup with a short per-process TTL.

Other large costs discussed in #61485 have already been addressed by separate PRs. I left the detailed breakdown in the issue comment, and this PR covers the remaining redundant Dag team lookup.

Impact

Team-ownership DB queries per grid page load:

	first load	follow-up poll
before	6	6
after	1	0

Also included

• New config [core] team_name_cache_ttl (default 30s).

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  • Opus 4.8

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[vincbeck]

CI is failing