Replace GatewayIntent#GUILD_EMOJIS_AND_STICKERS with GUILD_EXPRESSIONS

[freya022]

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Closes Issue: NaN

Description

Updates the intent to match Discord's name, will be clearer for #2753

[MinnDevelopment]

If the user does not migrate to the new intent, and has activated cache flags that require the GUILD_EXPRESSIONS intents, the cache flags will get disabled and a warning will be logged.

I don't think it will be disabled, since the check will include both regardless. I'll consider writing a test for this.

[freya022]

True, as it uses the raw intents, it sees both the old and new intent enabled.