[Test Improver] Add unit tests for projectAndNamespaceFiltering.utils

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🤖 This PR was created by Test Improver, an automated AI assistant focused on improving test coverage.

Goal and Rationale

shell/plugins/steve/projectAndNamespaceFiltering.utils.ts had no test coverage. It implements namespace/project filtering logic for the Steve API store — controlling which resources are fetched from specific namespaces/projects via the projectsornamespaces query parameter. The createParam function has non-trivial branching: prefix stripping (ns://, project://), include vs. exclude handling (leading -), and multi-value join logic. isEnabled guards behind three separate conditions (store type, workspace switcher, feature flag).

Approach

• isApplicable (5 tests): verifies Array detection for opt.namespaced — empty array, populated array, undefined, string, absent property.
• isEnabled (6 tests): mocks rootGetters with currentProduct and management/byId returning a perf setting. Covers happy path plus each early-return condition (wrong inStore, showWorkspaceSwitcher, forceNsFilterV2 disabled, default settings, null product).
• createParam (10 tests): covers undefined/empty input, plain namespace, ns:// prefix strip, project:// prefix strip, multi-include join, mixed-prefix join, single/multi exclude with leading dash, and the precedence rule that exclude overwrites include when both are present.
• checkAndCreateParam (4 tests): end-to-end delegation — non-array opt returns '', empty array returns '', populated array produces the query param, prefix stripping works.

Coverage Impact

25 tests added. All branches in createParam, isApplicable, and checkAndCreateParam covered; isEnabled covers all 4 branches.

Trade-offs

• Tests mock rootGetters inline — consistent with existing patterns in settings.test.ts.
• No new dependencies.

Reproducibility

YARN_IGNORE_ENGINES=true NODE_OPTIONS=--max_old_space_size=8192 yarn test:ci --testPathPattern='projectAndNamespaceFiltering.utils.test.ts'

Test Status

✅ All 25 tests pass. ESLint: 0 warnings.

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