chore: Update OWNERS with all members of the Install group

[rm3l]

Description

Follow-up to #1243

Actually set all members of the Install group as reviewers, as the Prow bot would request reviewers from people in the reviewers section.

Which issue(s) does this PR fix or relate to

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PR acceptance criteria

• Tests
• Documentation

How to test changes / Special notes to the reviewer

[openshift-ci]

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Details

Needs approval from an approver in each of these files:

• OWNERS

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