TPT-4616: Honor cancelled retries and use go work for vet/build

[zliang-akamai]

📝 Description

• Switch make vet/make build to Go 1.25 go vet work / go build work so the 3-module workspace is checked in one command. tidy stays per-module.
• Honor request cancellation during doRequest retry waits, and key the IPv6 create-option field that go vet work flagged.

✔️ How to Test

go vet work
go build work
make TEST_ARGS="-run TestDoRequest" test-unit

[Copilot]

Pull request overview

Updates the workspace build tooling and request retry behavior in linodego to better support the repository’s multi-module go.work layout and to respect context cancellation during retry backoff.

Changes:

• Switch make vet and make build to use go vet work / go build work for whole-workspace validation.
• Update Client.doRequest retry backoff to return early when the provided context is canceled.
• Fix an unkeyed struct literal in a VPC subnet unit test (flagged by workspace vetting).

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
Makefile	Moves vet/build to workspace-wide go ... work commands.
client.go	Makes retry wait context-aware (cancellation interrupts backoff).
test/unit/vpc_subnets_test.go	Keys the IPv6 create option field (Range) to satisfy vet.

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