Remove waiting for 2 seconds before resolving labels

In the github-bot we have found the need to wait a couple of seconds
before resolving labels on newly opened PRs.

That's because we stumbled upon what felt like consistency issues on
GitHub's side, where the github-bot got a webhook event about an opened
PR, its API would in some scenarios return 404 when fetching existing
labels on that PR.

Waiting a couple of seconds did the trick.

When the same code runs in a GitHub Action, we'd that same effect of not
asking too early out of the box, because it takes a while for Actions
to boot up and do their thing.

Refs nodejs/github-bot#79

lib/node-repo.js

@@ -12,14 +12,6 @@ const existingLabelsCache = new LRU({ max: 1, maxAge: 1000 * 60 * 60 })
 
 const fiveSeconds = 5 * 1000
 
-const sleep = (ms) => new Promise(resolve => setTimeout(resolve, ms))
-
-async function deferredResolveLabelsThenUpdatePr (options) {
-  const timeoutMillis = (options.timeoutInSec || 0) * 1000
-  await sleep(timeoutMillis)
-  return resolveLabelsThenUpdatePr(options)
-}
-
 async function resolveLabelsThenUpdatePr (options) {
   const times = options.retries || 5
   const interval = options.retryInterval || fiveSeconds
@@ -127,7 +119,7 @@ async function listFiles ({ owner, repo, pull_number }) {
 }
 
 exports.fetchExistingThenUpdatePr = fetchExistingThenUpdatePr
-exports.resolveLabelsThenUpdatePr = deferredResolveLabelsThenUpdatePr
+exports.resolveLabelsThenUpdatePr = resolveLabelsThenUpdatePr
 
 // exposed for testability
 exports._fetchExistingLabels = fetchExistingLabels