chore: deprecate old core api pkg, use latest instead

[adohe]

What type of PR is this?

/kind chore

What this PR does / why we need it:

deprecate old core api pkg, use latest api.kusion.io instead

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Additional documentation e.g., design docs, usage docs, etc.:

[coveralls]

Pull Request Test Coverage Report for Build 8577813920

Details

• 108 of 199 (54.27%) changed or added relevant lines in 22 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-1.0%) to 57.993%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/cmd/preview/options.go	4	5	80.0%
pkg/engine/operation/diff.go	0	1	0.0%
pkg/engine/operation/parser/spec_parser.go	0	1	0.0%
pkg/modules/generators/ordered_resources_generator.go	5	6	83.33%
pkg/modules/util.go	10	11	90.91%
pkg/cmd/generate/generator/generator.go	0	2	0.0%
pkg/modules/generators/app_configurations_generator.go	4	6	66.67%
pkg/modules/generators/workload/job_generator.go	5	7	71.43%
pkg/cmd/apply/options.go	5	8	62.5%
pkg/engine/spec/storages/local.go	0	3	0.0%

Files with Coverage Reduction	New Missed Lines	%
pkg/modules/util.go	1	83.19%

Totals
Change from base Build 8571845224:	-1.0%
Covered Lines:	7154
Relevant Lines:	12336

---

💛 - Coveralls

[liu-hm19]

lgtm