refactor: i/errorsx is now i/legacy/errorsx (#479)

We need still to add similar wrappers to internal/netxlite but we
will adopt a saner approach to error wrapping this time.

See https://github.com/ooni/probe/issues/1591

internal/errorsx/tls.go

@@ -1,33 +0,0 @@
-package errorsx
-
-import (
-	"context"
-	"crypto/tls"
-	"net"
-
-	"github.com/ooni/probe-cli/v3/internal/netxlite/errorsx"
-)
-
-// TLSHandshaker is the generic TLS handshaker
-type TLSHandshaker interface {
-	Handshake(ctx context.Context, conn net.Conn, config *tls.Config) (
-		net.Conn, tls.ConnectionState, error)
-}
-
-// ErrorWrapperTLSHandshaker wraps the returned error to be an OONI error
-type ErrorWrapperTLSHandshaker struct {
-	TLSHandshaker
-}
-
-// Handshake implements TLSHandshaker.Handshake
-func (h *ErrorWrapperTLSHandshaker) Handshake(
-	ctx context.Context, conn net.Conn, config *tls.Config,
-) (net.Conn, tls.ConnectionState, error) {
-	tlsconn, state, err := h.TLSHandshaker.Handshake(ctx, conn, config)
-	err = SafeErrWrapperBuilder{
-		Classifier: errorsx.ClassifyTLSHandshakeError,
-		Error:      err,
-		Operation:  errorsx.TLSHandshakeOperation,
-	}.MaybeBuild()
-	return tlsconn, state, err
-}