fix(MessageReaction): Address undefined burst properties

[Jiralite]

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

When receiving a non-burst reaction over the gateway, we get this (example) payload:

{
  user_id: '618976181026422814',
  type: 0,
  message_id: '1307361477182754877',
  message_author_id: '618976181026422814',
  member: {
    user: {
      username: 'jiralite',
      public_flags: 4210944,
      id: '618976181026422814',
      global_name: 'Jiralite',
      display_name: 'Jiralite',
      discriminator: '0',
      clan: null,
      bot: false,
      avatar_decoration_data: null,
      avatar: '096240dfad1c926c33f0a92b111aaaeb'
    },
    roles: [],
    premium_since: null,
    pending: false,
    nick: null,
    mute: false,
    joined_at: '2024-06-08T17:57:51.599000+00:00',
    flags: 0,
    deaf: false,
    communication_disabled_until: null,
    banner: null,
    avatar: null
  },
  emoji: { name: 'SkyLook', id: '649013670625542155' },
  channel_id: '1089254519268974712',
  burst: false,
  guild_id: '1089217648996401242'
}

This data is shoved into the cache here:

discord.js/packages/discord.js/src/client/actions/MessageReactionAdd.js

Lines 42 to 47 in c45d912

	const reaction = message.reactions._add({
	emoji: data.emoji,
	count: message.partial ? null : 0,
	me: user.id === this.client.user.id,
	burst_colors: data.burst_colors,
	});

burst_colors is not here, but we make sure the property exists. This means here, it's set to undefined:

discord.js/packages/discord.js/src/structures/MessageReaction.js

Lines 55 to 61 in c45d912

	if ('burst_colors' in data) {
	/**
	* Hexadecimal colors used for this super reaction
	* @type {?string[]}
	*/
	this.burstColors = data.burst_colors;
	}

me_burst is also not here, which means this is undefined too:

discord.js/packages/discord.js/src/structures/MessageReaction.js

Line 39 in c45d912

this.meBurst = data.me_burst;

Interestingly, there does not seem to be a way for bots to burst react, so doing Boolean(data.me_burst) should be enough. For burst_colors... since that is always present, I've added an array check. If it's not an array, then it's likely missing and should be left alone.

Tested also with no partials and [Partials.Channel, Partials.GuildMember, Partials.GuildScheduledEvent, Partials.Message, Partials.Reaction, Partials.ThreadMember, Partials.User].

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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