Source Slack: add default value for channel filters during discover

[arsenlosenko]

What

Resolving issue described in this oncall issue:
https://github.com/airbytehq/oncall/issues/2865

How

Sync crashes on discover stage due to a fact that config does not have channel_filters, changed code a bit so this confg field would have a default value

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1 Ignored Deployment

Name	Status	Preview	Comments	Updated (UTC)
airbyte-docs	⬜️ Ignored (Inspect)	Visit Preview		Sep 21, 2023 2:46pm

[github-actions]

source-slack test report (commit 7e1268fefb) - ❌

⏲️ Total pipeline duration: 105mn11s

Step	Result
Connector package install	✅
Build source-slack docker image for platform linux/x86_64	✅
Unit tests	✅
Acceptance tests	❌
Code format checks	✅
Validate airbyte-integrations/connectors/source-slack/metadata.yaml	✅
Connector version semver check	✅
Connector version increment check	❌
QA checks	✅

🔗 View the logs here

☁️ View runs for commit in Dagger Cloud

Please note that tests are only run on PR ready for review. Please set your PR to draft mode to not flood the CI engine and upstream service on following commits.
You can run the same pipeline locally on this branch with the airbyte-ci tool with the following command

airbyte-ci connectors --name=source-slack test

[airbyte-oss-build-runner]

source-slack test report (commit 869cb6d0fc) - ❌

⏲️ Total pipeline duration: 54mn51s

Step	Result
Connector package install	✅
Build source-slack docker image for platform linux/x86_64	✅
Unit tests	✅
Acceptance tests	❌
Code format checks	✅
Validate airbyte-integrations/connectors/source-slack/metadata.yaml	✅
Connector version semver check	✅
Connector version increment check	✅
QA checks	✅

🔗 View the logs here

☁️ View runs for commit in Dagger Cloud

Please note that tests are only run on PR ready for review. Please set your PR to draft mode to not flood the CI engine and upstream service on following commits.
You can run the same pipeline locally on this branch with the airbyte-ci tool with the following command

airbyte-ci connectors --name=source-slack test

[airbyte-oss-build-runner]

source-slack test report (commit 98c0d11b62) - ✅

⏲️ Total pipeline duration: 54mn44s

Step	Result
Connector package install	✅
Build source-slack docker image for platform linux/x86_64	✅
Unit tests	✅
Acceptance tests	✅
Code format checks	✅
Validate airbyte-integrations/connectors/source-slack/metadata.yaml	✅
Connector version semver check	✅
Connector version increment check	✅
QA checks	✅

🔗 View the logs here

☁️ View runs for commit in Dagger Cloud

Please note that tests are only run on PR ready for review. Please set your PR to draft mode to not flood the CI engine and upstream service on following commits.
You can run the same pipeline locally on this branch with the airbyte-ci tool with the following command

airbyte-ci connectors --name=source-slack test