[SDK-4252] Remove deprecated EmailManager

[ewanharris]

🔧 Changes

EmailManager was deprecated in favour of EmailProviderManager. As we're doing a new major we want to remove this deprecated API

📚 References

🔬 Testing

📝 Checklist

• All new/changed/fixed functionality is covered by tests (or N/A)
• I have added documentation for all new/changed functionality (or N/A)

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.06 ⚠️

Comparison is base (8a484c8) 95.23% compared to head (873f83e) 95.17%.

Additional details and impacted files

@@            Coverage Diff             @@
##             beta     #218      +/-   ##
==========================================
- Coverage   95.23%   95.17%   -0.06%     
==========================================
  Files          38       37       -1     
  Lines        7282     7192      -90     
==========================================
- Hits         6935     6845      -90     
  Misses        276      276              
  Partials       71       71              

Impacted Files	Coverage Δ
management/management.gen.go	100.00% <ø> (ø)
management/management.go	100.00% <ø> (ø)

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.