feat: show the disabled state of deployment targets and workers

[NickJosevski]

Stacked on #694 — merges into nj/issue-311, not main. Independent of #731; they touch no files in common.

Answers the "should view/list surface the disabled state?" question on #694: yes. Without it enable/disable has no read-back — the only way to confirm a toggle was the web UI.

What changed

The state is added to every surface that already reports on a machine:

	table	json	basic
deployment-target list	IS DISABLED column	IsDisabled	— (name only)
deployment-target view	IS DISABLED column	IsDisabled	Disabled: true
worker list	IS DISABLED column	IsDisabled	— (name only)
worker view	IS DISABLED column	IsDisabled	Disabled: true

The per-type views (deployment-target ssh view, worker listening-tentacle view, and the rest) gain a Disabled row — each set shares one ViewRun, so that is one line per resource.

Two deliberate choices:

• Follows tenant list, which already prints an IS DISABLED column — this is not a new idea in the CLI.
• One name everywhere: IsDisabled in JSON, IS DISABLED in tables, Disabled in basic output — all named after the API field, rather than inverting to "Enabled" on some surfaces.

Workers are included because #731 adds worker enable|disable; shipping that without a way to see the result would recreate the gap this PR closes. Say the word and I'll split them.

Test evidence

New tests, all end-to-end through the root command against the mock HTTP server:

• pkg/cmd/target/list/list_test.go, pkg/cmd/target/view/view_test.go
• pkg/cmd/worker/list/list_test.go, pkg/cmd/worker/view/view_test.go
• pkg/cmd/target/shared/view_test.go, pkg/cmd/worker/shared/view_test.go — one per-type view each, covering the shared ViewRun row.

Each asserts the table column, the JSON field and (where applicable) the basic-output line, for both an enabled and a disabled machine.

go build ./... clean; go test ./pkg/... all pass, no failures. gofmt/go vet report only pre-existing issues in files this PR does not touch. No live server is required.

Note on the rebase

Rebased onto current main, which had rewritten target/list, target/view, worker/list and worker/view (#717 and the worker endpoint fixes). Two things to know:

• The disabled-state additions were re-applied on top of main's newer code, so the type columns keep main's describeTargetType / describeWorkerStyle / machinescommon.GetCommunicationStyle versions.
• main already has internal (package list / package view) test files at list_test.go and view_test.go in all four directories, so these tests now sit beside them in *_disabled_test.go as external _test packages. In target/view they reuse the rootResource that view_ecs_test.go already defines rather than declaring a second one.

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