chore: rename .yaml to .yml (#895)

* chore: rename .yml to .yaml

* chore: remove .yml from prettierrc

codecov.yaml

@@ -0,0 +1,40 @@
+codecov:
+  require_ci_to_pass: false
+
+comment:
+  show_carryforward_flags: yes
+
+coverage:
+  notify:
+    slack:
+      default:
+        url: secret:v1::ALa1/e2X+k36fPseab5D7+kBFc9bJyIoIQioD0IMA5jr+0HXVpBRNDCHZhHjCdGc67yff6PPixPEOLwEZpxC37rM23RBZOYlqAq9A5e0MeZVlEoVq19aOYN4Xel17hMJ6GGm7n17wrYpCpcvlVSqNrN0+cr3guVDyG10kQyfh2Y=
+        threshold: 1%
+        only_pulls: false
+        branches:
+          - "main"
+  status:
+    patch:
+      default:
+        informational: yes
+    project:
+      default:
+        target: 70%
+        informational: yes
+
+ignore:
+  # This is generated code.
+  - coderd/database/models.go
+  - coderd/database/query.sql.go
+  - coderd/database/databasefake
+  # These are generated or don't require tests.
+  - cmd
+  - coderd/tunnel
+  - coderd/database/dump
+  - coderd/database/postgres
+  - peerbroker/proto
+  - provisionerd/proto
+  - provisionersdk/proto
+  - scripts/datadog-cireport
+  - site/.storybook
+  - rules.go