SAN DIEGO – The Border Patrol, reacting to a breach it discovered in a steel-pole border wall believed to be used by smugglers, gave activists no warning this month when it bulldozed the U.S. side of a cross-border garden on an iconic bluff overlooking the Pacific Ocean. On Saturday, after a public apology for “the unintentional destruction,” the agency allowed the activists in a highly restricted area to plant sticky monkey-flowers, seaside daisies and other native species in Friendship Park, which was inaugurated by first lady Pat Nixon in 1971 as a symbol of bilateral bonds.