fix: minimize template manager logs response size

[dobrac]

Stop returning unused duplicit logs. Limit the log entries count (more should be requested by setting offset).

Should improve the following error:

polling received unrecoverable error: rpc error: code = ResourceExhausted desc = grpc: received message larger than max (4258626 vs. 4194304)

---

Note

Adds a capped limit to TemplateStatusRequest and drops legacy logs strings, returning only structured logEntries with offset/level filtering.

• Protocol (packages/orchestrator/template-manager.proto):
  • Add optional limit to TemplateStatusRequest for log pagination.
  • Remove repeated string logs from TemplateBuildStatusResponse; reserve fields 3,4.
• Server (internal/template/server/template_status.go):
  • Enforce per-request log limit (max 100), respecting offset and level; stop formatting/returning string logs.
  • Return only logEntries.
• Generated code (template-manager.pb.go):
  • Reflects new limit field and removal of logs field; updates descriptors and accessors accordingly.

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[linear]

ENG-3196 Minimize template build log size returned