[Backport] magento/magento2#12396: Total Amount cart rule without tax

[eduard13]

Original Pull Request

#21288
Added new condition type to give user opportunity to choose the configuration.

Description (*)

I thought about the fix of what should be fixed in here. But I guess it's up to the user what to choose and what conditions to have to apply the rule.
I decided to add new Cart Attribute to Subtotal (Excl. Tax) which is basically one of the totals base_subtotal_with_discount

Fixed Issues (if relevant)

1. magento/magento2#<12396>: "Total Amount" cart rule without tax

Manual testing scenarios (*)

1. Go to the Admin Panel. Open Marketing->Cart Price Rules
2. Add new rule or edit existing one
3. Under the Condition tab you will be able to see new Configuration Subtotal (Excl. Tax).

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[magento-engcom-team]

Hi @eduard13. Thank you for your contribution
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[dmytro-ch]

@magento-engcom-team give me test instance

[magento-engcom-team]

Hi @dmytro-ch. Thank you for your request. I'm working on Magento instance for you

[magento-engcom-team]

Hi @dmytro-ch, here is your new Magento instance.
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[magento-engcom-team]

Hi @dmytro-ch, thank you for the review.
ENGCOM-4540 has been created to process this Pull Request

[soleksii]

✔️ QA Passed

[ghost]

Hi @eduard13, thank you for your contribution!
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