replay: use die_for_incompatible_opt2() for option validation

replay: use die_for_incompatible_opt2() for option validation

In preparation for adding the --ref-action option, convert option
validation to use die_for_incompatible_opt2(). This helper provides
standardized error messages for mutually exclusive options.

The following commit introduces --ref-action which will be incompatible
with certain other options. Using die_for_incompatible_opt2() now means
that commit can cleanly add its validation using the same pattern,
keeping the validation logic consistent and maintainable.

This also aligns git-replay's option handling with how other Git commands
manage option conflicts, using the established die_for_incompatible_opt*()
helper family.

Signed-off-by: Siddharth Asthana <siddharthasthana31@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>