[stripe] hardcoded admin env vars

[colinlin-stripe]

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[mattmueller-stripe]

nit: Maybe add something to comment like:

e.g. HARDCODED_ADMIN_USERNAMES=colinlin,mattmueller

[mattmueller-stripe]

Should we log here as well? It seems like checkAdminAccess is logged, so might be double-logging in the normal case, but we also use this function directly below

[colinlin-stripe]

kept user null check and changed isHardcodedAdmin to accept a username so no redundant null check logs