fix: add CEL to block user from changing External rollout strategy type to others #383
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Description of your changes
I have:
Made placement CRD changes to block changing from external to other types of strategys..
Add API validation test
Run
make reviewableto ensure this PR is ready for review.How has this code been tested
Special notes for your reviewer
This is related to resource snapshot changes where an external strategy type CRP will not create a resourceSnapshot. The update run controller makes the snapshot vs the placement controller. Otherwise, race conditions could occur when the user updates the spec and two controllers handle the resourceSnapshots concurrently.