PR sync trigger + coverage config

[jonmattgray]

Pull Request

Checklist

• Have you read Digital Catapult's Code of Conduct?
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.

PR Type

• Chore

Linked tickets

https://digicatapult.atlassian.net/browse/NIDT-188

High level description

Trigger npm tests on GitHub PR sync/open/reopen rather than on push. NOTE - Only triggers if PR has no merge conflicts with the base branch.
Set c8 config for this repo

Detailed description

Describe alternatives you've considered

Operational impact

Additional context

[Copilot]

Pull Request Overview

This PR adds code coverage reporting to the project using c8 (a native V8 code coverage tool). The implementation includes integration with GitHub Actions to automatically report coverage metrics on pull requests.

• Adds c8 package for code coverage collection
• Configures coverage reporting for unit and rate limit tests
• Adds a GitHub Actions workflow job to generate and report coverage metrics on PRs

Reviewed Changes

Copilot reviewed 3 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
package.json	Adds c8 as a dev dependency and wraps unit/ratelimit test commands with c8 for coverage collection; adds new coverage:report script
package-lock.json	Installs c8 v10.1.3 and its dependencies including istanbul tooling
.gitignore	Excludes the coverage/ directory from version control
.github/workflows/test.yaml	Adds a new coverage job that runs tests with coverage and reports results to PRs using zgosalvez/github-actions-report-lcov action; updates quote styles to double quotes for consistency
.c8rc.json	Configures c8 to include TypeScript source files, exclude test directories and generated routes, and output lcov format reports

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