chore: use same tag filtering for ENVs

[mbevc1]

Let's use same tag filetrs as we use for other commands, like Controls and Repos. This change also allows having commas in tag filters.

Also add missing update control test

[claude]

Claude finished @mbevc1's task in 1m 26s —— View job

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Review: chore: use same tag filtering for ENVs

• Gather context (diff, related commands)
• Static analysis (go build, go vet — both clean)
• Review code changes
• Post review

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Verdict: LGTM. Small, well-scoped change that correctly aligns list environments with list controls and list repos.

What the change does

• cmd/kosli/listEnvironments.go:110 — switches the --tag flag from StringSliceVar to StringArrayVar. This is the substantive fix: StringSliceVar splits each value on commas, so a tag like key:a,b would be silently broken into two filters. StringArrayVar preserves the whole value and only accumulates one entry per --tag occurrence — matching listControls.go:98 and listRepos.go:106. ✅
• This composes correctly with the query builder at listEnvironments.go:138-140, which does params.Add("tag", tag) per element, so each --tag becomes its own tag= query param. ✅
• cmd/kosli/root.go:319 — help text reworded to match the controls/repos wording ("Can be repeated to match more than one tag"). Consistent. ✅
• cmd/kosli/lifecycle_test.go:48 — adds the missing update control entry to the beta-commands test. Good catch; closes a gap where newUpdateControlCmd wasn't asserted as beta. ✅

Verification

• go build ./... — passes
• go vet ./cmd/kosli/ — passes

Minor / optional

• The PR notes the change "allows having commas in tag filters," but there's no test exercising that behavior directly for list environments (understandable, since it needs the local server). If you want to lock it in cheaply, a small unit-style assertion that --tag key:a,b yields a single tag param — rather than two — would prevent a future regression back to StringSliceVar. Not a blocker.

Nice consistency cleanup — this removes a real footgun (comma-splitting) rather than just cosmetic alignment.