refactor(ShardClientUtil): logic de-duplication

[almeidx]

Please describe the changes this PR makes and why it should be merged:

🤖 Generated by Copilot at 4b576b6

Summary

🚚🔧🧹

This pull request refactors the sharding logic of discord.js to use a common function calculateShardId from the @discordjs/sharding package, which improves code quality and maintainability. It also moves the function definition from the util package to the sharding package, which reduces the API surface and the risk of breaking changes.

Oh we're the coders of the discord.js crew
And we like to keep our code tidy and true
So we moved the calculateShardId to the sharding pack
And we refactored the logic with a simple hack

Walkthrough

• Move calculateShardId function from util to sharding package (link)
• Import calculateShardId function from @discordjs/sharding in ShardClientUtil.js (link)
• Replace inline shard id calculation with calculateShardId function call in ShardClientUtil.js (link)

Status and versioning classification:

• Code changes have been tested against the Discord API, or there are no code changes

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2 Ignored Deployments

Name	Status	Preview	Comments	Updated (UTC)
discord-js	⬜️ Ignored (Inspect)			May 1, 2023 8:02pm
discord-js-guide	⬜️ Ignored (Inspect)			May 1, 2023 8:02pm