Bug 1992103 - Align async modules rejection order with fulfillment order r=jonco

This patch inverts the order in which we reject promises in
AsyncModuleExecutionRejected to match AsyncModuleExecutionFulfilled:
first the promise corresponding to the leaf module (the one that throws)
is rejected, and then its ancestors.

This change was discussed at the July 2025 TC39 meeting.

Spec PR: tc39/ecma262#3695
test262: tc39/test262#4591

Differential Revision: https://phabricator.services.mozilla.com/D267210

UltraBlame original commit: a3cf4d1eef17209c4c4194e07f38fe870c417781

Author: marco-c