move collide function to crd package

[OliverMKing]

Description

Moves the collision check to being exported in our crd package. This is needed so we can create custom webhooks outside this repo that use the same logic.

How Has This Been Tested?

e2e and unit tested.

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [x] Any dependent changes have been merged and published in downstream modules

[coveralls]

Pull Request Test Coverage Report for Build 7008134673

• 40 of 42 (95.24%) changed or added relevant lines in 2 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+1.4%) to 80.19%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/webhook/nginxingress.go	8	10	80.0%
<!--	Total:	40	42	95.24%	-->

Files with Coverage Reduction	New Missed Lines	%
pkg/webhook/nginxingress.go	1	57.38%
<!--	Total:	1		-->

Totals
Change from base Build 6948852193:	1.4%
Covered Lines:	2951
Relevant Lines:	3680

---

💛 - Coveralls

[OliverMKing]

/ok-to-test sha=53288d8