occm: Fix not found checks for LoadBalancers do not cover all possible cases

[bd3lage]

What this PR does / why we need it:

Which issue this PR fixes(if applicable):
fixes #1935

Special notes for reviewers:

Release note:

Fixes IsNotFound checklist when LB is queried by Name instead of Id

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: bd3lage (85d6069)

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[jichenjc]

/ok-to-test

[jichenjc]

/lgtm
/approve

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