CHIA-1525 Make PreValidationResult take SpendBundleConditions instead of NPCResult

[AmineKhaldi]

Purpose:

PreValidationResult currently uses NPCResult without error possibility in this context, so it's simpler to use SpendBundleConditions directly here.

Current Behavior:

PreValidationResult holds NPCResult and its users have logic to get to SpendBundleConditions from there.

New Behavior:

PreValidationResult holds SpendBundleConditions and its users simply leverage that without needing extra logic.

[coveralls-official]

Pull Request Test Coverage Report for Build 11106596781

Details

• 20 of 20 (100.0%) changed or added relevant lines in 5 files are covered.
• 23 unchanged lines in 13 files lost coverage.
• Overall coverage increased (+0.03%) to 90.983%

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Files with Coverage Reduction	New Missed Lines	%
chia/data_layer/data_store.py	1	95.64%
chia/daemon/keychain_proxy.py	1	73.03%
chia/full_node/full_node_api.py	1	82.58%
chia/rpc/rpc_server.py	1	88.82%
chia/farmer/farmer.py	1	72.27%
chia/full_node/full_node_store.py	1	92.09%
chia/timelord/timelord_launcher.py	1	70.55%
chia/daemon/client.py	1	73.33%
chia/_tests/core/util/test_file_keyring_synchronization.py	1	97.14%
chia/consensus/blockchain.py	2	95.26%

Totals
Change from base Build 11074710326:	0.03%
Covered Lines:	102052
Relevant Lines:	112141

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💛 - Coveralls

[arvidn]

looks good!