Clean up eng/tools/internal dependencies (Azure#23237)

* Clean up eng/tools/internal dependencies

* Update CODEOWNERS

---------

Co-authored-by: Chenjie Shi <[email protected]>

Author: Alancere

.github/CODEOWNERS

@@ -102,6 +102,7 @@
 
 # Add owners for go sdk tool
 /eng/tools/generator          @ArcturusZhang @lirenhe @tadelesh @raych1
+/eng/tools/internal           @ArcturusZhang @lirenhe @tadelesh @raych1
 
 # AzureSDKOwners: @benbp
 # ServiceLabel: %EngSys

eng/tools/internal/coverage/coverage.go

@@ -5,7 +5,7 @@ import (
 	"errors"
 	"flag"
 	"fmt"
-	"io/ioutil"
+	"io"
 	"log"
 	"os"
 	"path/filepath"
@@ -57,7 +57,7 @@ func readConfigData(coverageConfig string) *codeCoverage {
 	check(err)
 	defer jsonFile.Close()
 
-	byteValue, err := ioutil.ReadAll(jsonFile)
+	byteValue, err := io.ReadAll(jsonFile)
 	check(err)
 
 	var cov codeCoverage
@@ -113,7 +113,7 @@ func parseCoverageFiles(coverageFiles []string) []float64 {
 		check(err)
 		defer xmlFile.Close()
 
-		byteValue, err := ioutil.ReadAll(xmlFile)
+		byteValue, err := io.ReadAll(xmlFile)
 		check(err)
 
 		coveragePercent, err := parseCoveragePercent(byteValue)