Remove redundant forwarding rule in filter table

[tnqn]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
#87748 removed the clusterCIDR check in the forwarding rules, making the two rules identical except the comments and the comments became a little confusing.

This PR merges the two rules.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[k8s-ci-robot]

@tnqn: This issue is currently awaiting triage.

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[tnqn]

/assign @freehan

[tnqn]

/retest

[fejta-bot]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
Stale issues rot after an additional 30d of inactivity and eventually close.

If this issue is safe to close now please do so with /close.

Send feedback to sig-contributor-experience at kubernetes/community.
/lifecycle stale

[tnqn]

@andrewsykim could you please take a look?

/test pull-kubernetes-node-e2e-containerd

[tnqn]

/remove-lifecycle stale

[k8s-triage-robot]

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/lifecycle stale

[tnqn]

/remove-lifecycle stale
/assign @aojea
/assign @andrewsykim

[aojea]

/lgtm
/assign @thockin @danwinship
another one for the bucket of cleanups :)

[thockin]

Thanks!

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: thockin, tnqn

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[tnqn]

/retest

[aojea]

/retest
/Lgtm

[tnqn]

/retest

[k8s-ci-robot]

@tnqn: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-kubernetes-e2e-gci-gce-ipvs	95a706b	link	false	/test pull-kubernetes-e2e-gci-gce-ipvs

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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