Replace temporary cost estimate status handling for targeted runs

[radditude]

This is a follow-up to #24834, to include a few more bits of targeted plan handling from a separate PR to go-tfe.

It:

• updates go-tfe
• replaces the temporary handling for cost estimate status tfe.CostEstimateSkippedDueToTargeting
• adds sad path tests for the version check which prevents remote backend users from initiating targeted plans if their version of the API doesn't support them

[codecov]

Codecov Report

Merging #24989 into f-remote-target will increase coverage by 0.01%.
The diff coverage is 100.00%.

Impacted Files	Coverage Δ
backend/remote/backend_common.go	54.57% <100.00%> (ø)
dag/marshal.go	52.27% <0.00%> (-1.14%)	⬇️
states/statefile/version4.go	55.70% <0.00%> (-0.28%)	⬇️
terraform/node_resource_plan.go	93.27% <0.00%> (+1.68%)	⬆️
backend/remote/backend_plan.go	78.57% <0.00%> (+4.76%)	⬆️

[apparentlymart]

LGTM!

[mikenomitch]

lgtm! but I'd wait for Martins +1 :)

[ghost]

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