crypto/tls: check if quic conn can send session ticket

On SendSessionTicket, returns nil if SessionTicketsDisabled is disabled in config.

Fixes #62032

Change-Id: Id0c89e2e6fb0805bbf108bb0cafdabdfbaf3897f
Reviewed-on: https://go-review.googlesource.com/c/go/+/528755
Reviewed-by: Roland Shoemaker <roland@golang.org>
Reviewed-by: Damien Neil <dneil@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Mark Freeman <markfreeman@google.com>

quic.go

@@ -303,6 +303,9 @@ type QUICSessionTicketOptions struct {
 // Currently, it can only be called once.
 func (q *QUICConn) SendSessionTicket(opts QUICSessionTicketOptions) error {
 	c := q.conn
+	if c.config.SessionTicketsDisabled {
+		return nil
+	}
 	if !c.isHandshakeComplete.Load() {
 		return quicError(errors.New("tls: SendSessionTicket called before handshake completed"))
 	}