Remove codecov config file (#10969)

.codecov.yml

@@ -1,18 +0,0 @@
-comment:
-  layout: "flags, files"
-  behavior: default
-  require_changes: true   # only comment on changes in coverage
-  require_base: yes       # [yes :: must have a base report to post]
-  require_head: yes       # [yes :: must have a head report to post]
-  after_n_builds: 3       # wait for all OS test coverage builds to post comment
-  branches:               # branch names that can post comment
-    - "master"
-
-coverage:
-  status:
-    project: off
-    patch: off
-
-ignore:  # ignore hcl2spec generated code for coverage and mocks
-  - "**/*.hcl2spec.go"
-  - "**/*_mock.go"