fix: set team id to none on enterprise installs

[GabeL7r]

Summary

When I'm using Python Bolt and install a Slack App at the enterprise level a team_id is supplied in the installation. This results in saving the installation with an enterprise id and team id, however, when retrieving the installation only the enterprise id is used, this should resolve the problem.

#1639

Testing

Run tests.

Category

• slack_sdk.web.WebClient (sync/async) (Web API client)
• slack_sdk.webhook.WebhookClient (sync/async) (Incoming Webhook, response_url sender)
• slack_sdk.socket_mode (Socket Mode client)
• slack_sdk.signature (Request Signature Verifier)
• slack_sdk.oauth (OAuth Flow Utilities)
• slack_sdk.models (UI component builders)
• slack_sdk.scim (SCIM API client)
• slack_sdk.audit_logs (Audit Logs API client)
• slack_sdk.rtm_v2 (RTM client)
• /docs (Documents)
• /tutorial (PythOnBoardingBot tutorial)
• tests/integration_tests (Automated tests for this library)

Requirements

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.
• I've run python3 -m venv .venv && source .venv/bin/activate && ./scripts/run_validation.sh after making the changes.

[salesforce-cla]

Thanks for the contribution! Before we can merge this, we need @GabeL7r to sign the Salesforce Inc. Contributor License Agreement.

[GabeL7r]

This could potentially break the callers if they are retrieving the team_id from the installation