[Test Improver] Add unit tests for aws.ts and kube.js utilities

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Goal and Rationale

Add unit tests for two pure utility files with no test coverage:

• shell/utils/aws.ts — exports four pure functions used across AWS provisioning flows: isIpv4Network, isIpv6Network, getVpcDisplayName, getSubnetDisplayName.
• shell/utils/kube.js — exports normalizeName, a string normalization function that produces valid Kubernetes resource names.

Both are pure functions with clear semantics, real branching logic, and multiple edge cases worth verifying.

Approach

• aws.test.ts: 17 tests covering all four exported functions — tag presence/absence, empty arrays, multiple tags, undefined fields, and the Ipv6CidrBlockAssociationSet array length check.
• kube.test.ts: 12 tests covering normalizeName — whitespace trimming, case-folding, space-to-hyphen replacement, consecutive hyphen collapse, leading/trailing hyphen removal, and null/undefined inputs.
• All tests use it.each with named object entries per project style.

Coverage Impact

File	Before	After
aws.ts — Stmts/Branches/Fns/Lines	0%	100%
kube.js — Stmts/Branches/Fns/Lines	0%	100%

Trade-offs

• Purely testing public API of pure functions — low maintenance burden.
• 29 tests total.

Reproducibility

node_modules/.bin/jest --no-coverage shell/utils/__tests__/aws.test.ts
node_modules/.bin/jest --no-coverage shell/utils/__tests__/kube.test.ts

Test Status

✅ All 29 new tests pass. No existing tests broken. Lint clean.

Fixes #

Warning

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