fix: missing auth header in impersonated service account credentials #555
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return correct auth header when preparing auth header
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This fixes an issue reporting that service account impersonation isn't working: #353.
The fixed code changes how ImpersonatedServiceAccountCredentials adds the auth header to its client. The primary issue was that the hash passed into the
applyfunction is not mutated. Instead, the underlying implementations copies the hash, performs authentication, then returns the copy. Theprepare_auth_headermethod was changed to align with the underlying implementation.