🐛 Fixed signup card in post plaintext and email preheader

[SimonBackx]

fixes https://github.com/TryGhost/Team/issues/3542

The signup card text was included in the post plaintext/excerpt and email preheader

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.04 ⚠️

Comparison is base (e6dbc0b) 71.72% compared to head (193c177) 71.69%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17163      +/-   ##
==========================================
- Coverage   71.72%   71.69%   -0.04%     
==========================================
  Files        1833     1833              
  Lines      116267   116269       +2     
  Branches    17283    17278       -5     
==========================================
- Hits        83393    83356      -37     
- Misses      31754    31787      +33     
- Partials     1120     1126       +6     

Flag	Coverage Δ
e2e-tests	66.48% <ø> (-0.02%)	⬇️
unit-tests	63.52% <100.00%> (-0.04%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
ghost/html-to-plaintext/lib/html-to-plaintext.js	97.05% <100.00%> (+0.05%)	⬆️

... and 13 files with indirect coverage changes

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