[v6] defaultScope is not working for upsert and update

Issue Description

I add defaultScope in model definition to exclude some columns. But .upsert() still return the exclude columns.

What are you doing?

Here is the link to the SSCCE for this issue: LINK-HERE

const Sequelize = require('sequelize')

const sequelize = new Sequelize('postgres://postgres:password@localhost:5432/postgres')
const Test = sequelize.define(
  'test',
  {
    tableId: { type: Sequelize.STRING, primaryKey: true },
    owner: { type: Sequelize.STRING, primaryKey: true },
    type: Sequelize.STRING,
  }, {
    defaultScope: { attributes: { exclude: ['type'] } }
  }
)

;(async () => {
  await sequelize.query('DROP TABLE IF EXISTS tests CASCADE')
  await Test.sync()
  const [test] = await Test.upsert({ tableId: 'aa', owner: 'bb', type: 'cc' }, { returning: true })

  console.log(test.toJSON())
})()

What do you expect to happen?

type should be excluded.

What is actually happening?

The output was Bar!

{ tableId: 'aa',
  owner: 'bb',
  type: 'cc',
  createdAt: 2020-07-09T10:39:34.770Z,
  updatedAt: 2020-07-09T10:39:34.770Z }

Additional context

Add any other context or screenshots about the feature request here.

Environment

• Sequelize version: 6
• Node.js version: 10
• Operating System: macOS
• If TypeScript related: TypeScript version: XXX

Issue Template Checklist

How does this problem relate to dialects?

• I think this problem happens regardless of the dialect.
• I think this problem happens only for the following dialect(s):
• I don't know, I was using PUT-YOUR-DIALECT-HERE, with connector library version XXX and database version XXX

Would you be willing to resolve this issue by submitting a Pull Request?

• Yes, I have the time and I know how to start.
• Yes, I have the time but I don't know how to start, I would need guidance.
• No, I don't have the time, although I believe I could do it if I had the time...
• No, I don't have the time and I wouldn't even know how to start.

Start with the supplied Sequelize model and the Test.upsert call using defaultScope attributes.exclude; compare how upsert and update apply scopes to returned attributes. Add regression coverage for excluding type and verify the returned object no longer includes it.