AffineDataCopyGeneration: don't use CL flag values inside the pass

AffineDataCopyGeneration pass relied on command line flags for internal logic
in several places, which makes it unusable in a library context (i.e. outside a
standalone mlir-opt binary that does the command line parsing).  Define
configuration flags in the constructor instead, and set them up to command
line-based defaults to maintain the original behavior.

PiperOrigin-RevId: 261322364