[Test Improver] Add unit tests for uiplugins.ts onExtensionsReady, getLatestExtensionVersion, installHelmChart

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🤖 This is an automated PR from Test Improver, an AI assistant for improving test coverage.

Goal

Add unit tests for three previously untested exported functions in shell/utils/uiplugins.ts. These functions handle extension loading, Helm chart version lookup, and Helm chart installation — all part of the UI Plugin system critical path.

Approach

• onExtensionsReady: Test early-return when already ready, dispatch of setReady on completion, sequential onLogIn calls per plugin, error resilience when a plugin's onLogIn throws, and graceful handling of a null plugins getter.
• getLatestExtensionVersion: Test first-compatible-version selection (skipping incompatible), no-compatible-versions path, missing chart path, and custom dispatch options.
• installHelmChart: Test default install action, upgrade action override, custom namespace, annotation content from chart metadata, and custom values passthrough.

All three functions are mocked cleanly with no real network/store I/O.

Coverage Impact

Metric	Before	After
Statements	34.23%	55.16%
Branches	100%	100%
Functions	15.38%	38.46%
Lines	34.23%	55.16%

(Remaining uncovered functions involve complex async polling loops with retries — waitForUIExtension, waitForUIPackage, createHelmRepository, getHelmChart, refreshHelmRepository, getHelmRepository* — which would require fake timers and intricate mock sequencing; left for a follow-up.)

Test Status

✅ 14/14 tests pass
✅ Lint clean (eslint --max-warnings 0)

Reproducibility

yarn test:ci shell/utils/__tests__/uiplugins-extra.test.ts
# or:
node_modules/.bin/jest --no-coverage shell/utils/__tests__/uiplugins-extra.test.ts

Fixes: N/A (new tests)

Warning

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