Added e2e test for member.added webhook

[illiteratewriter]

refs #15537

[codecov]

Codecov Report

Base: 52.46% // Head: 52.46% // No change to project coverage 👍

Coverage data is based on head (131938c) compared to base (06f6fc1).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #15554   +/-   ##
=======================================
  Coverage   52.46%   52.46%           
=======================================
  Files        1433     1433           
  Lines       92897    92897           
  Branches    10358    10358           
=======================================
  Hits        48739    48739           
+ Misses      42940    42937    -3     
- Partials     1218     1221    +3     

Impacted Files	Coverage Δ
ghost/admin/app/utils/publish-options.js	75.72% <0.00%> (-1.16%)	⬇️
ghost/admin/app/controllers/offer.js	42.10% <0.00%> (+0.52%)	⬆️
ghost/admin/app/components/gh-site-iframe.js	45.45% <0.00%> (+2.27%)	⬆️

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[naz]

Awesome change @illiteratewriter 👏 Good to be merged

[github-actions]

Thank you for your PR 🙏 It has now been merged 🎉 and will be in the next release, which is usually on a Friday. Hope to see you again soon 👋