TestUt[do not merge]: Refactor old statestorage

[healthjyk]

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What this PR does / why we need it:

Which issue(s) this PR fixes:

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[coveralls]

Pull Request Test Coverage Report for Build 8259226040

Details

• 155 of 219 (70.78%) changed or added relevant lines in 21 files are covered.
• 22 unchanged lines in 6 files lost coverage.
• Overall coverage decreased (-0.06%) to 73.272%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/engine/state/storages/util.go	0	1	0.0%
pkg/backend/storages/completion.go	6	8	75.0%
pkg/engine/operation/models/change.go	4	7	57.14%
pkg/backend/backend.go	7	11	63.64%
pkg/cmd/destroy/options.go	38	42	90.48%
pkg/cmd/apply/options.go	29	34	85.29%
pkg/engine/operation/diff.go	0	10	0.0%
pkg/engine/operation/graph/resource_node.go	15	29	51.72%
pkg/engine/operation/models/operation_context.go	0	21	0.0%

Files with Coverage Reduction	New Missed Lines	%
pkg/engine/operation/diff.go	1	0.0%
pkg/backend/storages/mysql.go	2	90.48%
pkg/backend/storages/completion.go	2	90.48%
pkg/backend/storages/s3.go	3	81.82%
pkg/backend/storages/oss.go	4	69.23%
pkg/backend/backend.go	10	64.06%

Totals
Change from base Build 8259122382:	-0.06%
Covered Lines:	7092
Relevant Lines:	9679

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💛 - Coveralls