Existing law provides, with respect to contracts and amendments to contracts entered into on or after January 1, 2011, with a public agency, as defined, for design professional services, that all provisions, clauses, covenants, and agreements contained in, collateral to, or affecting these contracts or amendments to contracts that purport to require the design professional to defend the public agency under an indemnity agreement, including the duty and the cost to defend, are unenforceable, except for claims that arise out of, pertain to, or relate to the negligence, recklessness, or willfu