fix: prevent coderd crashes from unsupported Tailnet RPCs (#28429) - #28961
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Workspace agents could call RefreshResumeToken and WorkspaceUpdates, even though agent connections do not configure the providers those RPCs require. The resulting nil dereference panicked a DRPC handler and crashed coderd. Limit the agent Tailnet surface to its supported RPCs, return `Unimplemented` when optional providers are absent, and recover panics in Coder-owned DRPC servers so they return an internal error instead of crashing the process. Refs: https://linear.app/codercom/issue/PLAT-464 (cherry picked from commit 156c8b6)
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Backport of #28429
Original PR: #28429 — fix: prevent coderd crashes from unsupported Tailnet RPCs
Merge commit: 156c8b6
PR created manually because the backport CI job is timing out.