fix(scheduler): wrong ARN generated in ScheduleGroup.grant* methods

[otaviomacedo]

The ScheduleGroup.grant*() methods are delegating to the methods in the auto-generated ScheduleGroupGrants class. This class is generating policies with an incorrect ARN. Instead of:

arn:aws:scheduler:<region>:xxx:schedule/my-group-name/*

it is generating:

arn:aws:scheduler:<region>:xxx:schedule-group/my-group-name/*

Since the code generation mechanism doesn't provide any way of specifying a custom logic for the ARN generation, replace the auto-generated ScheduleGroupGrants with hand-written one, in which the ARN is computed by:

private arnForScheduleInGroup(scheduleName: string): string {
  return Arn.format({
    region: this.resource.env.region,
    account: this.resource.env.account,
    partition: Aws.PARTITION,
    service: 'scheduler',
    resource: 'schedule',
    resourceName: this.resource.scheduleGroupRef.scheduleGroupName + '/' + scheduleName,
  });
}

Fixes #36165.

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