core: upgrade Go requirement to 1.26.0 (#8466)

* core: upgrade Go requirement to 1.26.0

As golang 1.27 has been released, this PR
- Bump Go version requirement to 1.26.0
- Update Go build version to 1.27.0

This is also for solving the issue encountered in 8092 of k8s update

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Bump golang ci

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Fix

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Fix

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Fix

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Migrate faillint to forbidigo, as failint has not bee updated for more than a year

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

---------

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

test/presubmit_test.go

@@ -8,7 +8,6 @@ import (
 	"go/parser"
 	"go/token"
 	"os"
-	"os/exec"
 	"path/filepath"
 	"strings"
 	"testing"
@@ -313,21 +312,3 @@ func importtype(s string) string {
 	}
 	return "std"
 }
-
-// TestPrometheusImports tests the imports path used for metrics. It depends on faillint to be installed: go install github.com/fatih/faillint
-func TestPrometheusImports(t *testing.T) {
-	if _, err := exec.LookPath("faillint"); err != nil {
-		fmt.Fprintf(os.Stderr, "Not executing TestPrometheusImports: faillint not found\n")
-		return
-	}
-
-	// make this multiline?
-	p := `github.com/prometheus/client_golang/prometheus.{NewCounter,NewCounterVec,NewCounterVec,NewGauge,NewGaugeVec,NewGaugeFunc,NewHistorgram,NewHistogramVec,NewSummary,NewSummaryVec}=github.com/prometheus/client_golang/prometheus/promauto.{NewCounter,NewCounterVec,NewCounterVec,NewGauge,NewGaugeVec,NewGaugeFunc,NewHistorgram,NewHistogramVec,NewSummary,NewSummaryVec}`
-
-	cmd := exec.Command("faillint", "-paths", p, "./...")
-	cmd.Dir = ".."
-	out, err := cmd.CombinedOutput()
-	if err != nil {
-		t.Fatalf("Failed: %s\n%s", err, out)
-	}
-}