fix(Message): Ensure channel is defined for clean content

[Jiralite]

Please describe the changes this PR makes and why it should be merged:
channel may be null and thus when passing to cleanContent(), a crash will occur on valid types. This is reproducible in 2 (known) ways:

1. Calling cleanContent on a forwarded message from a guild one is not in
2. Calling cleanContent on a interaction's response message from a guild one is not in

Stack trace:

TypeError: Cannot read properties of null (reading 'client')
    at /Users/jiralite/Documents/GitHub/Soulobby/Soulobby/node_modules/.pnpm/[email protected]_patch_hash=uqmtazwjzsnpehwi2ldoqezswq/node_modules/discord.js/src/util/Util.js:389:44
    at [Symbol.replace] (<anonymous>)
    at String.replaceAll (<anonymous>)
    at cleanContent (/Users/jiralite/Documents/GitHub/Soulobby/Soulobby/node_modules/.pnpm/[email protected]_patch_hash=uqmtazwjzsnpehwi2ldoqezswq/node_modules/discord.js/src/util/Util.js:362:14)
    at get cleanContent (/Users/jiralite/Documents/GitHub/Soulobby/Soulobby/node_modules/.pnpm/[email protected]_patch_hash=uqmtazwjzsnpehwi2ldoqezswq/node_modules/discord.js/src/structures/Message.js:594:36)
    at Soulobby.fire (/Users/jiralite/Documents/GitHub/Soulobby/Soulobby/source/events/interaction-create.ts:119:80)
    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)
Emitted 'error' event on Soulobby instance at:
    at emitUnhandledRejectionOrErr (node:events:407:10)
    at process.processTicksAndRejections (node:internal/process/task_queues:92:21)

In both cases, a message is constructed with a channel id that is not cached, so that will result in null being sent to the cleanContent(). This will resolve #10679—seems they're calling .toJSON() somewhere to achieve this or cleanContent directly.

Status and versioning classification:

• Code changes have been tested against the Discord API, or there are no code changes
• I know how to update typings and have done so, or typings don't need updating

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