🐛 Source Intercom: stop using time.sleep as a hacky rate limit

[bkrausz]

What

Intercom source syncs are currently unnecessarily slow. This is because we don't rely on the natural rate limit mechanism, and instead proactively sleep after each request. Many requests, when run in serial, take longer than the rate limit would care about, so the rate limit wouldn't even be triggered, and when it is the CDK's backoff will handle it without issue.

How

Removes the time.sleep

Recommended reading order

N/A

🚨 User Impact 🚨

Faster syncs

Pre-merge Checklist

• Grant edit access to maintainers (instructions)
• Secrets in the connector's spec are annotated with airbyte_secret
• Unit & integration tests added and passing. Community members, please provide proof of success locally e.g: screenshot or copy-paste unit, integration, and acceptance test output. To run acceptance tests for a Python connector, follow instructions in the README. For java connectors run ./gradlew :airbyte-integrations:connectors:<name>:integrationTest.
• Code reviews completed
• Documentation updated
  • Connector's README.md
  • Connector's bootstrap.md. See description and examples
  • Changelog updated in docs/integrations/<source or destination>/<name>.md including changelog. See changelog example
• PR name follows PR naming conventions

[CLAassistant]

All committers have signed the CLA.

[marcosmarxm]

Related PR: #5123