Feat: Webhook fixes / improvements (#2131)

* feat: webhook update

* feat: add headers to cel env

* fix: header casing

* feat: wire up edits

* fix: updates

* fix: finish wiring up updates

* fix: handle save on enter

* fix: lint

* feat: add slack and discord

* feat: initial slack setup

* fix: get slack working

* fix: rm discord for now

* fix: lint

* chore: gen

* fix: explicit save button

* feat: add link to CEL docs

* feat: add callout for reaching out to support

* feat: docs

* refactor: challenge

* fix: naming

* fix: return

* fix: resp codes

* fix: webhooks beta flag

* fix: rm discord

* fix: docs

cmd/hatchet-migrate/migrate/migrations/20250813183355_v1_0_36.sql

@@ -0,0 +1,9 @@
+-- +goose Up
+-- +goose StatementBegin
+ALTER TYPE v1_incoming_webhook_source_name ADD VALUE IF NOT EXISTS 'SLACK';
+-- +goose StatementEnd
+
+-- +goose Down
+-- +goose StatementBegin
+-- intentionally blank
+-- +goose StatementEnd