disable review_acts_as_lgtm for kpt-config-sync

[sdowell]

With the new request to require the Github UI approval button on our
repository, we've lost the ability to effectively approve a PR
without granting lgtm. Disabling review_acts_as_lgtm will enable an
approver to grant the approval state/label without granting lgtm.

Context:

GoogleContainerTools/kpt-config-sync#1002 Requested for us to require the Approval UI button, despite our usage of prow to manage lgtm/approval. There is a bit of redundancy now with the approval mechanisms, but this should allow us to separate approve from lgtm again.

[sdowell]

/assign @janetkuo

[janetkuo]

/lgtm

[chaodaiG]

this
/lgtm
but I'm not on the team any more so:
/assign @cjwagner

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cjwagner, sdowell

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Needs approval from an approver in each of these files:

• OWNERS [cjwagner]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[google-oss-prow]

@sdowell: Updated the plugins configmap in namespace default at cluster default using the following files:

• key plugins.yaml using file prow/oss/plugins.yaml

In response to this:

With the new request to require the Github UI approval button on our
repository, we've lost the ability to effectively approve a PR
without granting lgtm. Disabling review_acts_as_lgtm will enable an
approver to grant the approval state/label without granting lgtm.

Context:

GoogleContainerTools/kpt-config-sync#1002 Requested for us to require the Approval UI button, despite our usage of prow to manage lgtm/approval. There is a bit of redundancy now with the approval mechanisms, but this should allow us to separate approve from lgtm again.

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