add n4d pricing

[mariafromano-25]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

Adds pricing for n4d machine shapes

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

gce: add n4d pricing

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

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[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: mariafromano-25
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[mariafromano-25]

@roycaihw

[jackfrancis]

/release-note-edit

gce: add n4d pricing

[jackfrancis]

/ok-to-test

[jackfrancis]

Is n4d pricing not appropriate for inclusion in the customCpuPricePerHour, customMemoryPricePerHourPerGb, and customPreemptibleDiscount categories?

cc @towca

[mariafromano-25]

@x13n your insight would be super helpful! Thank you :)

[x13n]

Well, it depends. Does n4d support custom machine types?

[roycaihw]

#8657 (comment) Yes, N4D does support custom machine types