don't fail on not found for RequiresTigeraSecure as that just indicat…

[paulgmiller]

…es crds have not been applied

Description

Was trying to apply tigera-operator without any CRDS (but with the arg --manage-crds) and failed in RequiresTigeraSecure.

Seems like not found should be treated differently than other errors here.

For PR author

• Tests for change.
• If changing pkg/apis/, run make gen-files
• If changing versions, run make gen-versions

For PR reviewers

A note for code reviewers - all pull requests must have the following:

• Milestone set according to targeted release.
• Appropriate labels:
  • kind/bug if this is a bugfix.
  • kind/enhancement if this is a a new feature.
  • enterprise if this PR applies to Calico Enterprise only.