refactor(code_push_protocol)!: remove duplicate/deprecated fields

[felangel]

Description

• refactor(code_push_protocol): remove duplicate/deprecated fields

Type of Change

• ✨ New feature (non-breaking change which adds functionality)
• 🛠️ Bug fix (non-breaking change which fixes an issue)
• ❌ Breaking change (fix or feature that would cause existing functionality to change)
• 🧹 Code refactor
• ✅ Build configuration change
• 📝 Documentation
• 🗑️ Chore

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (dd14321) 100.00% compared to head (c7042d5) 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##              main      #859    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files           77       145    +68     
  Lines         2731      3519   +788     
==========================================
+ Hits          2731      3519   +788     

Impacted Files	Coverage Δ
...lib/src/messages/get_usage/get_usage_response.dart	100.00% <ø> (ø)
...b/src/messages/get_usage/get_usage_response.g.dart	100.00% <ø> (ø)
...ode_push_protocol/lib/src/models/subscription.dart	100.00% <ø> (ø)
...e_push_protocol/lib/src/models/subscription.g.dart	100.00% <ø> (ø)
...ib/src/commands/account/account_usage_command.dart	100.00% <100.00%> (ø)

... and 64 files with indirect coverage changes

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