OneOnEach deploy strategy does not reset iteration cursor on re-initialize #4731

What happened?

amber/src/main/scala/org/apache/texera/amber/engine/architecture/deploysemantics/deploystrategy/OneOnEach.scala::OneOnEach.initialize replaces available but leaves index at its prior value. A reused instance re-initialized with a new array continues counting from the prior position and may report the new array as exhausted before any element is returned.

How to reproduce?

val s = OneOnEach()
s.initialize(Array(nodeA, nodeB)); s.next(); s.next()  // index = 2
s.initialize(Array(nodeC))                              // index NOT reset
s.next()  // throws IndexOutOfBoundsException — new array has 1 element but index already 2

Version

1.1.0-incubating (Pre-release/Master)