[util][testutil] Add NO_IDE env check to skip check only runs in IDE

[at15]

There are many ad-hoc unit tests that can only run in IDE (due to config, exec order etc.) and need to be skipped if the test is run in CI or just through makefile

Then in package's TestMain we can call TestPkg to enable/disable entire package, and if just a single func we can use tesutil.SkipIf(testutil.EnvTrue("NO_IDE"))

func TestPkg(pkg string) bool {
	pkgLock.Lock()
	defer pkgLock.Unlock()

	noIDE := os.Getenv("NO_IDE")
	if noIDE == "true" {
		log.Printf("test package %s is skipped, set NO_IDE=false to enable it, currently NO_IDE=%s", pkg, noIDE)
		return false
	}
}

in Makefile

GO = CGO_ENABLED=0 go
# NO_IDE is used to skip test or packages that are meant to run in IDE manually due to hard coded config
GOTEST = NO_IDE=true $(GO) test