feat: enhance function listing with category and description filters

[Gijsreyn]

PR Summary

Adds --category and --description filtering options to the dsc function list command:

• -c/--category — filter by function category; can be specified multiple times to require all categories (AND filter).
• -d/--description — case-insensitive search within the function description, supports wildcards (*, ?).

PR Context

Fixes #1581

[Copilot]

Pull request overview

This PR enhances the dsc function list CLI to support filtering functions by metadata (category and description), addressing the UX request in #1581 by avoiding the need to post-filter results in a shell pipeline.

Changes:

• Add --category/-c support (repeatable; treated as an AND filter) for dsc function list.
• Add --description/-d support for case-insensitive wildcard matching against function descriptions.
• Add localization strings and Pester coverage for category/description filtering and combined filters.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
lib/dsc-lib/src/functions/mod.rs	Adds FunctionCategory::ALL and FromStr parsing to enable CLI category argument parsing with a localized invalid-category error.
lib/dsc-lib/locales/en-us.toml	Adds the localized functions.invalidCategory message used by FunctionCategory::FromStr.
dsc/src/args.rs	Extends the function list subcommand args with --category and --description.
dsc/src/subcommand.rs	Implements category AND-filtering and description wildcard filtering in list_functions.
dsc/locales/en-us.toml	Adds localized help text for the new args and a new invalid-description-filter error string.
dsc/tests/dsc_function_list.tests.ps1	Adds Pester tests for category filtering, description filtering, and combined filters.

[Gijsreyn]

@SteveL-MSFT, has something recently changed on the workflows that it instantly errors out?

[SteveL-MSFT]

@SteveL-MSFT, has something recently changed on the workflows that it instantly errors out?

Let me look into this, code coverage reporting was added

[SteveL-MSFT]

Ok, I think this should fix CI #1619

Basically, the PR broke the build, but the workflow is not reporting that correctly. Look at the build checks and expand the build item to see the actual error that needs to be fixed.