operator filtering: add notes from OLM perspective

[joelanford]

Description

Added a new column and some notes to the operator filtering investigation doc from my perspective. Not necessarily meant to be merged, but I'm not opposed either.

Github / Jira issue:

Type of change

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Code Improvements (Refactoring, Performance, CI upgrades, etc)
• Internal repo assets (diagrams / docs on github repo)
• This change requires a documentation update on openshift docs

How Has This Been Tested?

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Expected Outcome

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[openshift-ci]

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[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[openshift-merge-robot]

PR needs rebase.

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[openshift-ci]

@joelanford: all tests passed!

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