[FSSDK-12539] Remove Coveralls from CI checks (#447)

* [FSSDK-12539] Remove Coveralls from CI checks

Coveralls coverage reporting is no longer needed. Remove the
unit_test_coverage job, coverage.sh script, and README badge.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* [FSSDK-12539] Restore unit_test_coverage job name for branch protection

Keep the job name so required check still passes, but remove the
goveralls upload step.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: Mat001

.github/workflows/go.yml

@@ -43,17 +43,12 @@ jobs:
 
   unit_test_coverage:
     runs-on: ubuntu-latest
-    env: 
-      COVERALLS_TOKEN: ${{ secrets.GITHUB_TOKEN }}
     steps:
     - uses: actions/checkout@v3
     - uses: actions/setup-go@v3
       with:
         go-version: '1.21.0'
-    - run: |
-        go test -race -covermode atomic -coverprofile=covprofile ./...
-        go install github.com/mattn/goveralls@latest
-        goveralls -coverprofile=covprofile -service=github
+    - run: go test -race -covermode atomic -coverprofile=covprofile ./...
 
   benchmark_test:
     runs-on: ubuntu-latest

README.md

@@ -1,7 +1,6 @@
 # Optimizely Go SDK
 
 [![Go Report Card](https://goreportcard.com/badge/github.com/optimizely/go-sdk)](https://goreportcard.com/report/github.com/optimizely/go-sdk)
-[![Coverage Status](https://coveralls.io/repos/github/optimizely/go-sdk/badge.svg?branch=master)](https://coveralls.io/github/optimizely/go-sdk?branch=master)
 [![Apache 2.0](https://img.shields.io/badge/License-Apache%202.0-blue.svg)](http://www.apache.org/licenses/LICENSE-2.0)