Slack: Use Member Join Event instead of Message

[SanderGi]

Changes outlined in this task:
https://app.asana.com/0/1203067047205953/1205542154436394

The production app will need the "member_joined_channel" event added to the "bot_events" section of the "settings" section of the app manifest:

bot_events:
      - member_joined_channel
      - message.channels
      - message.groups

Q/A checklist

• Do a code review of the changes
• Add any new dependencies to poetry & export to requirementst.txt (poetry export -o requirements.txt)
• Carefully think about the stuff that might break because of this change
• The relevant pages still run when you press submit
• If you added new settings / knobs, the values get saved if you save it on the UI
• The API for those pages still work (API tab)
• The public API interface doesn't change if you didn't want it to (check API tab > docs page)
• Do your UI changes (if applicable) look acceptable on mobile?

[devxpy]

Have you updated the manifests for dev and prod apps and made sure they are backwards compact for existing integrations?

[SanderGi]

Have you updated the manifests for dev and prod apps and made sure they are backwards compact for existing integrations?

Just added it to the prod app manifest - dev app is already set. It was backwards compatible for the test channels I had so should be fine for all existing integrations. This is a very minor change to listen to an event that would otherwise be ignored.

[devxpy]

Did you test this PR before submitting it?

[devxpy]

It looks like the slack event is this:

2023-09-27T06:23:36.376796307Z > slack_event: {'token': 'tGdQuVhZFM8n79gOJvnqmd1y', 'team_id': 'T05JGLKFD71', 'context_team_id': 'T05JGLKFD71', 'context_enterprise_id': None, 'api_app_id': 'A05KQQ0NHUL', 'event': {'type': 'member_joined_channel', 'user': 'U05LL96137B', 'channel': 'C05L1158P89', 'channel_type': 'C', 'team': 'T05JGLKFD71', 'event_ts': '1695795754.000600'}, 'type': 'event_callback', 'event_id': 'Ev05US80QDMW', 'event_time': 1695795754, 'authorizations': [{'enterprise_id': None, 'team_id': 'T05JGLKFD71', 'user_id': 'U05KQRQLM0U', 'is_bot': True, 'is_enterprise_install': False}], 'is_ext_shared_channel': False, 'event_context': '4-eyJldCI6Im1lbWJlcl9qb2luZWRfY2hhbm5lbCIsInRpZCI6IlQwNUpHTEtGRDcxIiwiYWlkIjoiQTA1S1FRME5IVUwiLCJjaWQiOiJDMDVMMTE1OFA4OSJ9'}

Which throws this key error - https://dara-network.sentry.io/issues/4507231400/?project=4504338635423744&query=is%3Aunresolved&referrer=issue-stream&stream_index=0

[SanderGi]

Did you test this PR before submitting it?

Weird. I did test it and it worked locally. Lmk take a look at it again

[SanderGi]

It looks like the slack event is this:

2023-09-27T06:23:36.376796307Z > slack_event: {'token': 'tGdQuVhZFM8n79gOJvnqmd1y', 'team_id': 'T05JGLKFD71', 'context_team_id': 'T05JGLKFD71', 'context_enterprise_id': None, 'api_app_id': 'A05KQQ0NHUL', 'event': {'type': 'member_joined_channel', 'user': 'U05LL96137B', 'channel': 'C05L1158P89', 'channel_type': 'C', 'team': 'T05JGLKFD71', 'event_ts': '1695795754.000600'}, 'type': 'event_callback', 'event_id': 'Ev05US80QDMW', 'event_time': 1695795754, 'authorizations': [{'enterprise_id': None, 'team_id': 'T05JGLKFD71', 'user_id': 'U05KQRQLM0U', 'is_bot': True, 'is_enterprise_install': False}], 'is_ext_shared_channel': False, 'event_context': '4-eyJldCI6Im1lbWJlcl9qb2luZWRfY2hhbm5lbCIsInRpZCI6IlQwNUpHTEtGRDcxIiwiYWlkIjoiQTA1S1FRME5IVUwiLCJjaWQiOiJDMDVMMTE1OFA4OSJ9'}

Which throws this key error - https://dara-network.sentry.io/issues/4507231400/?project=4504338635423744&query=is%3Aunresolved&referrer=issue-stream&stream_index=0

Edit: I see you already fixed it

[SanderGi]

Did you test this PR before submitting it?

Weird. I did test it and it worked locally. Lmk take a look at it again

I think I figured out what went wrong: I had both the prod app and dev app integrated to the same channel and saw the prod app working but thought it was the dev app 🤦‍♂️. Won't happen again