Add environment path variable resource

[Steve Lee (SteveL-MSFT)]

Microsoft.Windows/EnvironmentVariable currently mixes scalar and path semantics, so callers cannot reliably retrieve variables such as PATH as arrays. This implements the working-group decision to separate those contracts while preserving mixed list operations.

• Keep Microsoft.Windows/EnvironmentVariable scalar-only.
• Add Microsoft.Windows/EnvironmentPathVariable with array-valued value, write-only delimiter, and write-only setAction.
• Allow Microsoft.Windows/EnvironmentVariableList to get, set, and test mixed scalar/path items.
• Add list export across current-user and all-users scopes. Export uses scalar items by default and path items when requested by a path-shaped filter.
• Support AND semantics within filters, OR semantics across filters, and case-insensitive * wildcard matching for names.
• Add Rust and Pester coverage for path operations, mixed lists, filtering, and export representation.

Fixes: #1724

[Copilot]

🟡 Changes recommended

The manifest must require name for scalar list items to match executable validation.

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Pull request overview

Adds a dedicated path environment-variable resource while extending mixed list operations, filtering, export support, and test coverage.

Changes:

• Introduces EnvironmentPathVariable.
• Supports mixed scalar/path list operations and filtered exports.
• Adds Rust and Pester coverage.
• Retains required-name validation for scalar list items.

File summaries

File	Summary
resources/environment_variable/tests/environment_variable_test.tests.ps1	Updates mixed-list tests.
resources/environment_variable/tests/environment_variable_single_test.tests.ps1	Updates scalar tests.
resources/environment_variable/tests/environment_variable_set.tests.ps1	Tests scalar/path setting.
resources/environment_variable/tests/environment_variable_get.tests.ps1	Tests scalar/path retrieval.
resources/environment_variable/tests/environment_variable_export.tests.ps1	Tests export and filtering.
resources/environment_variable/tests/environment_path_variable.tests.ps1	Tests the new path resource.
resources/environment_variable/src/types.rs	Defines scalar/path types and validation.
resources/environment_variable/src/main.rs	Handles path and export inputs.
resources/environment_variable/src/environment.rs	Implements mixed operations and export filtering.
resources/environment_variable/locales/en-us.toml	Adds validation and export messages.
resources/environment_variable/environment_variable.dsc.manifests.json	Defines resource schemas and operations.

Review details

• Files reviewed: 11/11 changed files
• Comments generated: 1
• Review effort level: Lite

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[github-actions]

😊 Code Coverage Report

Changed Code Coverage

86% (80%+ coverage)

Metric	Value
Changed lines analyzed	718
Lines covered by tests	623
Coverage percentage	86%

🔵 Full Codebase Coverage

82% (good)

Metric	Value
Total executable lines	19475
Lines covered by tests	16145
Coverage percentage	82%

Changed code coverage measures only Rust lines added/modified in this PR.
Full codebase coverage measures all instrumented Rust lines across the project.

[Copilot]

🔵 Needs a closer look

The missing-operation message advertises unsupported export syntax and incorrectly presents filter input as mandatory.

Review details

Suppressed comments (1)

Previously missed (1) — in code that hasn't changed since the last review.

resources/environment_variable/locales/en-us.toml:4

• This usage advertises export --path and makes --input appear mandatory, but export is accepted only with --list and its filter input is optional. Please show the export syntax separately so the error directs callers to a valid command.

• Files reviewed: 11/11 changed files
• Comments generated: 0 new
• Review effort level: Balanced