Retry loop does not refresh credentials after recent SRA identity&auth refactor

[lucix-aws]

Before the I&A rewrite (#2364), credentials were retrieved in the Signing middleware. The rewrite moved that step out into a separate middleware that now occurs before the retry loop, meaning credentials are not refreshed within said loop as they should:

    Finalize stack step
        DisableAcceptEncodingGzip
        ResolveAuthScheme
>>>>>>> GetIdentity
        ResolveEndpointV2
        disableHTTPS
        AWSChecksum:ComputeInputPayloadChecksum
        ComputePayloadHash
        SigV4ContentSHA256Header
        spanRetryLoop
>>>>>>> Retry
        addInputChecksumTrailer
        RetryMetricsHeader
        setLegacyContextSigningOptions
        Signing

[github-actions]

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