[release-1.26] fix: truncate pls frontendIPConfig name if it's too long

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #4537

/assign jwtty

Fix privateLinkService creation failure in case customer's subnet name or privateLinkService name is too long.

[jwtty]

/kind bug
/approve
/lgtm

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[jwtty]

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[jwtty]

/test pull-cloud-provider-azure-check-1-26