Format code with prettier and gofumpt (#1971)

This commit fixes the style issues introduced in b8417b0 according to the output
from prettier and gofumpt.

Details: https://deepsource.io/gh/vdaas/vald/transform/ff8813ee-0fca-4249-b906-6463628484e2/

Co-authored-by: deepsource-autofix[bot] <62050782+deepsource-autofix[bot]@users.noreply.github.com>

CHANGELOG.md

@@ -62,22 +62,26 @@
 - [Helm Operator Chart Reference](https://github.com/vdaas/vald/blob/v1.7.3/charts/vald-helm-operator/README.md)
 
 ### Changes
-:sparkles: New feature 
-- Add disable balanced update features & use generic type for BidirectionalStream [#1964](https://github.com/vdaas/vald/pull/1964)
-
-:bug: Bug fix
-- Fix grafana dashboard query for backoff retry count [#1961](https://github.com/vdaas/vald/pull/1961)
-
-
-:recycle: Refactor
-- Refactor conv.go [#1968](https://github.com/vdaas/vald/pull/1968)
-
-:memo: Document
-- Add new API parameter and update observability docs [#1966](https://github.com/vdaas/vald/pull/1966)
-
-:arrow_up: Dependency update
-- Update deps [#1969](https://github.com/vdaas/vald/pull/1969)
 
+:sparkles: New feature
+
+- Add disable balanced update features & use generic type for BidirectionalStream [#1964](https://github.com/vdaas/vald/pull/1964)
+
+:bug: Bug fix
+
+- Fix grafana dashboard query for backoff retry count [#1961](https://github.com/vdaas/vald/pull/1961)
+
+:recycle: Refactor
+
+- Refactor conv.go [#1968](https://github.com/vdaas/vald/pull/1968)
+
+:memo: Document
+
+- Add new API parameter and update observability docs [#1966](https://github.com/vdaas/vald/pull/1966)
+
+:arrow_up: Dependency update
+
+- Update deps [#1969](https://github.com/vdaas/vald/pull/1969)
 
 ## v1.7.2