Cleanup yaml formatting (#5151)

* Add yamllint config.
* Add yamllint workflow.
* Cleanup linting issues.
* Remove unnecessary `set -x -e` from workflows.

Signed-off-by: SuperQ <superq@gmail.com>

.stickler.yml

@@ -1,10 +1,10 @@
 ---
 linters:
-    golint:
-        min_confidence: 0.85
-        fixer: true
+  golint:
+    min_confidence: 0.85
+    fixer: true
 
 files:
-    ignore:
-        - 'vendor/*'
-        - 'pb/*'
+  ignore:
+    - 'vendor/*'
+    - 'pb/*'