use JSON merge patch to update labels/annotations

[zhangzujian]

Pull Request

• Make sure you have followed Kube-OVN Code Style.

What type of this PR

Examples of user facing changes:

• Features
• Bug fixes
• Docs
• Tests

Which issue(s) this PR fixes

Fixes #4229

[coveralls]

Pull Request Test Coverage Report for Build 12373433471

Details

• 16 of 165 (9.7%) changed or added relevant lines in 15 files are covered.
• 6 unchanged lines in 4 files lost coverage.
• Overall coverage increased (+0.02%) to 21.943%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/ovn_ic_controller/controller.go	0	1	0.0%
pkg/speaker/controller.go	0	1	0.0%
pkg/controller/endpoint.go	0	3	0.0%
pkg/util/patch.go	16	19	84.21%
pkg/controller/inspection.go	0	4	0.0%
pkg/ovn_ic_controller/ovn_ic_controller.go	0	4	0.0%
pkg/controller/external_gw.go	0	5	0.0%
pkg/controller/node.go	0	6	0.0%
pkg/controller/init.go	0	7	0.0%
pkg/controller/namespace.go	0	9	0.0%

Files with Coverage Reduction	New Missed Lines	%
pkg/controller/node.go	1	0.0%
pkg/controller/init.go	1	0.0%
pkg/ovn_leader_checker/ovn.go	2	0.0%
pkg/controller/pod.go	2	0.0%

Totals
Change from base Build 12368866861:	0.02%
Covered Lines:	10160
Relevant Lines:	46301

---

💛 - Coveralls