chore: fix prealloc findings

[sosheskaz]

Re-enables prealloc for production Go files and fixes the remaining live findings exposed by golangci-lint 2.9.0. Test files are excluded from prealloc, and the earlier test-helper preallocation changes have been reverted.

The production changes add known slice capacities in Object Storage rendering helpers without changing values, ordering, schemas, provider behavior, or exported APIs.

This PR also raises the acceptance-test sweeper's Go test timeout from 10 to 30 minutes. The previous CKS sweep exhausted the global 10-minute limit while sequentially deleting existing QA clusters.

Validation

• golangci-lint 2.9.0 with Go 1.26.5 (0 issues)
• go test ./coreweave/cks ./coreweave/object_storage
• gofmt -d on the restored test files
• all *_test.go files match the parent branch
• make -n testacc-sweep SUITES=cks TEST_ACC_SWEEP_ZONE=US-LAB-01A
• git diff --check

Caveats

The nested-worktree gopls diagnostics attempt returned no package metadata; the focused Go 1.26 tests and pinned lint run completed successfully.

[Copilot]

Pull request overview

This PR re-enables the prealloc golangci-lint linter for production Go code and resolves the resulting slice preallocation findings, primarily in Object Storage HCL rendering helpers. It also increases the acceptance-test sweeper per-suite go test timeout to reduce failures during longer cleanup runs.

Changes:

• Re-enable prealloc in .golangci.yaml while continuing to exclude it (and other heavy linters) for *_test.go files.
• Preallocate known-capacity []cty.Value slices in Object Storage rendering helpers to satisfy prealloc findings without changing rendered output.
• Increase testacc-sweep’s per-suite go test timeout from 10m to 30m in GNUmakefile.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
GNUmakefile	Increases acceptance-test sweeper per-suite timeout to 30 minutes to avoid premature timeouts during long sweeps.
coreweave/object_storage/resource_organization_access_policy.go	Preallocates statement/action/resource/principal slices to address prealloc findings without altering rendered policy structure.
coreweave/object_storage/data_source_bucket_policy_document.go	Preallocates per-statement lists/maps when building cty values to satisfy prealloc and keep output identical.
.golangci.yaml	Re-enables prealloc globally and explicitly excludes it from test files via exclusions rules.

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