This PR does a bunch of changes to prepare OnCall for Unified Slack App:
1. Install Slack via Chatops-Proxy. This change contains two parts:
getting a Slack install link from chatops-proxy
([code](https://github.com/grafana/oncall/pull/4232/files#diff-437a77d49fc04b92d315651b3df5991000b1ab74cf60aabb21aa77cb2823bf52R46))
and receiving a "slack installed" event from chatops-proxy
([code](https://github.com/grafana/oncall/pull/4232/files#diff-976d106f0962be5c1de5e35582193f68435ed0c17f2defd6bd2857bf6e27f65d)).
Also it means that OnCall doesn't need to register slack_links anymore
when slack is connected/disconnected. These changes are behind
UNIFIED_SLACK_APP_ENABLED flag and should be no-op if flag is not
enabled.
2. Get rid of Multiregionatily restrictions - instrument all slack
interactions with a ProxyMeta - json data telling chatops-proxy where to
route the interaction. Note, that it doesn't apply for "Add to
resolution notes" message action - it will be handled differently in
following PR.
3. Move all chatops-proxy related stuff from common/oncall-gateway to
apps/chatops-proxy
Minor changes:
1. Remove usage of **CHATOPS_V3** flag. Chatops v3 is already released
(It's a refactoring from previous quarter)
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Co-authored-by: Vadim Stepanov <vadimkerr@gmail.com>
Co-authored-by: Rares Mardare <rares.mardare@grafana.com>
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