feat: add update_only field request on Upsert API

[luthfifahlevi]

Adding update_only in body request to strict rule for update only, else will return not found error. This is to cover use case that make sure update only.

[coveralls]

Pull Request Test Coverage Report for Build 18222977557

Details

• 22 of 28 (78.57%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.02%) to 80.753%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
core/asset/service.go	8	10	80.0%
internal/server/v1beta1/asset.go	7	11	63.64%

Totals
Change from base Build 16903479425:	0.02%
Covered Lines:	7783
Relevant Lines:	9638

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💛 - Coveralls