Add integration tests for Slack bot interactions and configurations

[Subash-Mohan]

This pull request includes integration tests for Slack bot interactions and configurations

Slack Connector Enhancements:

• Updated the get_channel_messages function in backend/onyx/connectors/slack/connector.py to handle cases where the is_member field is unavailable, assuming the bot is always a member for DM channels.

Test Refactoring:

• Refactored imports in multiple test files (conftest.py, test_permission_sync.py, test_prune.py) to use the centralized SlackManager from tests.integration.common_utils.managers.slack instead of the previous location. [1] [2] [3]

New Test Fixtures and Helpers:

• Added a comprehensive slack_test_context fixture in backend/tests/integration/tests/slack/conftest.py to set up a Slack test environment, including creating bots, users, channels, and configurations.
• Introduced utility functions in backend/tests/integration/tests/slack/slack_test_helpers.py for sending and receiving messages, updating channel configurations, and validating UI elements like buttons.

How Has This Been Tested?

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Name	Status	Preview	Comments	Updated (UTC)
internal-search	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 5, 2025 6:41am

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