2.19.0

Various fixes & improvements

• ref(debug-files): Use temp file handle instead of keeping zips in memory (#1641) by @kamilogorek
• feat(crons): Bring back legacy token-auth checkin API (#1634) by @evanpurkhiser
• ref: Unhide sourcemaps inject command as its already GA (#1631) by @kamilogorek
• ref: Match case-insensitive value when finding repo by name (#1629) by @maxnowack
• ref(inject): Inject code snippet at the start (#1567) by @loewenheim
• feat(crons): Replace API checkins w/ send_envelope (#1618) by @evanpurkhiser