openapi: generate operationIds from route names

See https://fastapi.tiangolo.com/advanced/path-operation-advanced-configuration/#using-the-path-operation-function-name-as-the-operationid

Otherwise, the operationIds default to horrible names like get-tool-deployment-v1-tool-toolname-deployment-deployment-id-get and we don't want that when generating clients.

Bug: T356261