chore: replace bingo with Go 1.24 tool directives

[kuudori]

HYPERFLEET-1331

Remove bingo tool management in favor of native tool directives in go.mod (Go 1.24+).
Tool versions are pinned in go.mod/go.sum and resolved via go tool <name>.

Pinned versions (unchanged from bingo):

• goimports v0.40.0 → golang.org/x/tools (resolved to v0.47.0 via MVS)
• golangci-lint v2.7.0 → github.com/golangci/golangci-lint/v2 (resolved to v2.12.2 via MVS)
• helm-docs v1.14.2 → github.com/norwoodj/helm-docs v1.14.2
• kubeconform v0.7.0 → github.com/yannh/kubeconform (resolved to v0.8.0 via MVS)

[openshift-ci]

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[hyperfleet-ci-bot]

Risk Score: 2 — risk/medium

Signal	Detail	Points
PR size	1773 lines (>500)	+2
Sensitive paths	none	+0

_{Computed by hyperfleet-risk-scorer}

[openshift-ci]

@kuudori: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/validate-commits	5667250	link	true	/test validate-commits
ci/prow/lint	5667250	link	true	/test lint

Full PR test history. Your PR dashboard.

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