[Cherry-pick #2054 -> 1.19] Change diffBackends for NEG to not compare the API versions.

[sawsa307]

Cherry pick of #2054.

/assign @swetharepakula
/hold

[k8s-ci-robot]

Hi @sawsa307. Thanks for your PR.

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[sawsa307]

/unhold

[bowei]

/ok-to-test

[k8s-ci-robot]

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[sawsa307]

Closing as 1.19 is for GKE 1.24 clusters. Since 1.24 has become EOL so we are no longer maintaining this branch.