Add Maven dependency-resolution repositories

[brunoborges]

Description:
Maven builds that consume artifacts from private or internal repositories currently need to create or patch settings.xml themselves. This adds first-class dependency-resolution repository configuration while preserving the existing generated settings when the feature is unused.

The new mvn-repositories multiline input accepts repository-id:repository-url:snapshots-enabled entries and composes repository profiles with existing server credentials and GPG profiles. Additional inputs control whether Maven Central is included and whether it is searched first. Disabling Central emits a disabled override for Maven's Super POM repository, while an explicit central entry can replace it. The generated bundles and usage documentation are included.

Related issue:
Fixes: #1054

Check list:

• Ran npm run check locally (format, lint, build, test) and all checks pass.
• Mark if documentation changes are required.
• Mark if tests were added or updated to cover the changes.

[Copilot]

Pull request overview

Adds first-class support for configuring Maven dependency-resolution repositories in the generated settings.xml, so workflows can consume dependencies from private/internal repositories without hand-writing or patching Maven settings, while preserving existing behavior when the feature is unused.

Changes:

• Introduces new inputs (mvn-repositories, mvn-repositories-include-central, mvn-repositories-prioritize-central) and parses/validates them into structured settings.
• Extends settings.xml generation to emit an active profile containing <repositories> (including Central ordering/disable semantics) and composes cleanly with the existing GPG profile.
• Updates documentation, tests, and rebuilt dist/ bundles.

Show a summary per file

File	Description
src/constants.ts	Adds input names and Maven Central/profile constants used by the new feature.
src/auth.ts	Parses repository inputs and generates <profiles>/<repositories> plus <activeProfiles> in settings.xml.
README.md	Documents new inputs and adds a pointer to the advanced usage section.
docs/advanced-usage.md	Adds a full usage guide and example output for custom dependency repositories.
action.yml	Declares new action inputs and defaults for Central inclusion/ordering.
tests/auth.test.ts	Adds unit tests for parsing and XML generation (ordering, Central disable/override, escaping, composition with GPG).
dist/setup/index.js	Rebuilt bundle exporting new constants used by the action runtime.
dist/setup/81.index.js	Rebuilt bundle for auth logic (parsing + settings generation updates).
dist/cleanup/index.js	Rebuilt bundle reflecting newly exported constants.

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• Files reviewed: 6/9 changed files
• Comments generated: 1
• Review effort level: Lite