[CO-372] The Great Cleanup

[KtorZ]

Description

U/S branch for The Great Cleanup

This aggregates the following PRs (all already reviewed):

• [CO-373] [CO-373] Move wallet@Pos.Util.Mnemonic to wallet-new@Cardano.Wallet.Kernel.BIP39 #3663
• [CO-394] [CO-394] Remove Legacy* and V0* stuff #3667
• [CO-402] [CO-402] Remove dependency on Pos.Wallet.Web.Tracking.Decrypt #3683
• [CO-403] [CO-403] Remove wallet dependency from Cardano/Wallet/Server/Plugins.hs  #3686
• [CO-404] [CO-404] Remove old wallet types from Example #3687
• [CO-405] [CO-405] Remove old wallet code from API.V1.Types #3688
• [CO-406] [CO-406] Remove swagger import #3689
• [CO-380] [CO-380] Removing Migration.hs Migration/Types.hs and Migration/Monad… #3700
• [CO-413] [CO-413] Removing wallet-new/src/Cardano/Wallet/Orphans* #3707
• [CO-426] [CO-426] - Follow-up on CO-373 #3738
• [CO-430] [CO-430] Cleanup cardano-sl references to cardano-sl-wallet #3750

Linked issue

[CO-372]

Type of change

• 🐞 Bug fix (non-breaking change which fixes an issue)
• 🛠 New feature (non-breaking change which adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)
• 🏭 Refactoring that does not change existing functionality but does improve things like code readability, structure etc
• 🔨 New or improved tests for existing code
• ⛑ git-flow chore (backport, hotfix, etc)

Developer checklist

• I have read the style guide document, and my code follows the code style of this project.
• If my code deals with exceptions, it follows the guidelines.
• I have updated any documentation accordingly, if needed. Documentation changes can be reflected in opening a PR on cardanodocs.com, amending the inline Haddock comments, any relevant README file or one of the document listed in the docs directory.
• CHANGELOG entry has been added and is linked to the correct PR on GitHub.

Testing checklist

• I have added tests to cover my changes.
• All new and existing tests passed.

QA Steps

Screenshots (if available)

[denisshevchenko]

Awesome!