Basically #4593 for all other classes where de_json returns subclasses.
Doing this first will make #4635 easier for those classes.

Canditates

(all subclasse of TelegramObject that have subclasses on their own)

• BackgroundFill Refactor Tests for TelegramObject Classes with Subclasses #4654
• BackgroundType Refactor Tests for TelegramObject Classes with Subclasses #4654
• BotCommandScope Refactor Tests for TelegramObject Classes with Subclasses #4654
• ChatBoostSource Refactor Tests for TelegramObject Classes with Subclasses #4654
• ChatMember Refactor Tests for TelegramObject Classes with Subclasses #4654
• MaybeInaccessibleMessage
• MenuButton Refactor Tests for TelegramObject Classes with Subclasses #4654
• PaidMedia Refactor Tests for TelegramObject Classes with Subclasses #4654
• ReactionType Refactor Tests for TelegramObject Classes with Subclasses #4654
• RevenueWithdrawalState
• TransactionPartner
• InputMedia doesn't use de_json because input-only class
• InputPaidMedia doesn't use de_json because input-only class
• InlineQueryResult doesn't use de_json because input-only class
• InputMessageContent doesn't use de_json because input-only class
• PassportElementError