[skip ci] Macro for go coverage script (#8999)

Signed-off-by: Nyhmo <yihua.mo@zilliz.com>

scripts/run_go_codecov.sh

 #!/usr/bin/env bash
 
+FILE_COVERAGE_INFO="go_coverage.txt"
+FILE_COVERAGE_HTML="go_coverage.html"
+
 set -e
-echo "mode: atomic" > go_coverage.txt
+echo "mode: atomic" > ${FILE_COVERAGE_INFO}
 
 for d in $(go list ./internal... | grep -v vendor); do
     go test -race -coverpkg=./... -coverprofile=profile.out -covermode=atomic "$d"
     if [ -f profile.out ]; then
-        sed '1d' profile.out >> go_coverage.txt
+        sed '1d' profile.out >> ${FILE_COVERAGE_INFO}
         rm profile.out
     fi
 done
 
-go tool cover -html=./go_coverage.txt -o ./go_coverage.html
-echo "Export go coverage report to go_coverage.html"
+go tool cover -html=./${FILE_COVERAGE_INFO} -o ./${FILE_COVERAGE_HTML}
+echo "Export go coverage report to ${FILE_COVERAGE_HTML}"