Remove CircleCI config (#1439)

.circleci/config.yml

@@ -1,61 +0,0 @@
-version: 2.1
-orbs:
-  codecov: codecov/codecov@1.1.1
-executors:
-  current-go:
-    resource_class: large
-    docker:
-      - image: cimg/go:1.15
-  prior-go:
-    resource_class: large
-    docker:
-      - image: cimg/go:1.14
-
-build-template: &build-template
-  environment:
-    TEST_RESULTS: /tmp/test-results # path to where test results will be saved
-
-  steps:
-    - checkout
-    - run: mkdir -p $TEST_RESULTS # create the test results directory
-
-    - restore_cache: # restores saved cache if no changes are detected since last run
-        keys:
-          - cimg-go-pkg-mod-{{ checksum "go.sum" }}
-
-    - run:
-        name: "Precommit and Coverage Report"
-        command: |
-          make ci
-          cp coverage.{out,txt,html} $TEST_RESULTS/
-
-    - codecov/upload:
-        file: "coverage.txt"
-
-    - save_cache:
-        key: cimg-go-pkg-mod-{{ checksum "go.sum" }}
-        paths:
-          - "/home/circleci/go/pkg/mod"
-
-    - store_artifacts:
-        path: /tmp/test-results
-        destination: opentelemetry-go-test-output
-
-    - store_test_results:
-        path: /tmp/test-results
-
-jobs:
-  current-go:
-    executor: current-go
-    <<: *build-template
-
-  prior-go:
-    executor: prior-go
-    <<: *build-template
-
-workflows:
-  version: 2
-  build:
-    jobs:
-      - current-go
-      - prior-go