rETH oracle returns rate and not market price

[hats-bug-reporter[bot]]

Github username: -- Submission hash (on-chain): 0x7dc695abd400310c2ca37ba9eb5cb062052421cc8448f5f3803bf4a5df902de4 Severity: high severity

Description: The rETH oracle used in the balancer oracle returns the rate and not a market price, which may result in a misprice of the oracle during periods of depegging