BUG/IMPROVEMENT: Map subtotal to GA4 value

[badz0]

Describe the bug
Rudderstack maps the Order completed event total to GA4 value, but the descriptions of those properties don't match.
It would be better to map the subtotal property to GA4 value as the definitions of them are the same.

Expected behavior
Rudderstack maps subtotal instead of total to GA4 value.
It would reduce work of anyone who uses GA4 destination, especially in device mode where transformations not available.

Screenshots
GA4 value property

Rudderstack subtotal and total properties

Additional context
Link to GA4 purchase event
Link to Rudderstack Order completed event

[contributor-support]

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