Add a test assertion in ioredis that asserts the instance metrics

[bizob2828]

Description

We're missing a test assertion for Datastore/instance/Redis/<host>/<port> in ioredis versioned tests. This metric is going to be needed to link APM entities to AWS elasticache.

Additional context

This test should have the metric

  t.test('creates expected metrics', { timeout: 5000 }, (t) => {
    t.plan(6)
    agent.on('transactionFinished', function (tx) {
      const expected = [
        [{ name: 'Datastore/all' }],
        [{ name: 'Datastore/Redis/all' }],
        [{ name: 'Datastore/operation/Redis/set' }]
      ]

      t.assertMetrics(tx.metrics, expected, false, false)
      t.end()
    })

    helper.runInTransaction(agent, (transaction) => {
      redisClient
        .set('testkey', 'testvalue')
        .then(function () {
          transaction.end()
        }, t.error)
        .catch(t.error)
    })
  })

If not, we need to fix the instrumentation

[workato-integration]

https://new-relic.atlassian.net/browse/NR-274808