Refactor: remove bug.body field and just append comment on bug creation.

[anuraghazra]

In the Bug Model Instead of using bug.body for description of the bug, we can just add a comment while creating the bug that way we don't have to worry about managing two different reactions schemas.

BugVilla/server/models/bugModel.js

Lines 30 to 34 in 2f1e603

	body: {
	type: String,
	required: true,
	maxLength: 1000
	},

duplicate code introduced by current approach can be fixed:

BugVilla/server/controllers/BugsController.js

Line 334 in 2f1e603

exports.addOrRemoveReaction = async (req, res) => {

BugVilla/server/controllers/CommentsController.js

Line 145 in 2f1e603

exports.addOrRemoveReaction = async (req, res) => {