feat: add Codecov integration for unit test coverage

[ptomanRH]

Summary

• Add lcov reporter to c8 config so Codecov can parse coverage output
• Add Codecov upload step to test workflow using OIDC authentication (no secret needed)
• Upload only from the Node 24 matrix run (matches MAIN_NODE_VER)
• Add codecov.yml with informational status checks, unit-tests flag with carryforward

Changes

File	Change
package.json	Add lcov to c8 reporter list
.github/workflows/test.yml	Add permissions: id-token: write + Codecov upload step
codecov.yml	Coverage config: informational checks, flag setup, ignore patterns

Manual follow-up

After merging:

1. Go to https://app.codecov.io/gh/guacsec/trustify-da-javascript-client
2. Click the Flags tab
3. Click Enable flag analytics

Ref: COVERPORT-254

Summary by Sourcery

Integrate Codecov coverage reporting into the project’s CI test workflow and configuration.

New Features:

• Enable Codecov uploads from the CI test workflow using OIDC authentication and unit-test coverage flags.
• Add Codecov configuration to control coverage status checks, flags, and comment layout.

Enhancements:

• Extend test coverage reporting to generate lcov output consumable by external coverage tooling.

CI:

• Grant OIDC token permissions and add a Codecov upload step to the test workflow, restricted to the main Node.js version matrix run.

[sourcery-ai]

Reviewer's Guide

Adds Codecov coverage reporting by generating lcov output from c8, uploading coverage from the Node 24 CI job via OIDC, and configuring Codecov project/patch statuses, flags, and ignore patterns.

File-Level Changes

Change	Details	Files
Enable LCOV coverage output so Codecov can consume test coverage produced by c8.	Extend c8 reporter configuration to include lcov output alongside existing html, json, and text reporters.	package.json
Integrate Codecov upload into the GitHub Actions test workflow using OIDC and limit uploads to the main Node version.	Grant the workflow job id-token: write permission required for OIDC-based authentication. Add a Codecov upload step that runs only when the matrix node version equals MAIN_NODE_VER. Configure the Codecov action to use OIDC auth, upload lcov.info with the unit-tests flag, target the guacsec/trustify-da-javascript-client slug, and not fail CI on upload errors.	.github/workflows/test.yml
Define Codecov project configuration for coverage statuses, ignores, and flags.	Configure project and patch coverage statuses to be informational with auto targets and 1% thresholds. Specify ignore patterns for node_modules, dist, and coverage directories. Define a unit-tests flag with carryforward enabled for flag analytics and historical tracking. Configure the Codecov PR comment layout to include reach, diff, flags, and files with default behavior.	codecov.yml

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[sourcery-ai]

Hey - I've left some high level feedback:

• Consider relying on Codecov’s default slug (from GITHUB_REPOSITORY) instead of hardcoding guacsec/trustify-da-javascript-client in the upload step to avoid issues if the repository is renamed or the workflow is reused elsewhere.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider relying on Codecov’s default `slug` (from `GITHUB_REPOSITORY`) instead of hardcoding `guacsec/trustify-da-javascript-client` in the upload step to avoid issues if the repository is renamed or the workflow is reused elsewhere.

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[codecov-commenter]

Welcome to Codecov 🎉

Once you merge this PR into your default branch, you're all set! Codecov will compare coverage reports and display results in all future pull requests.

Thanks for integrating Codecov - We've got you covered ☂️

[ruromero]

Replace hardcoded slug with ${{ github.repository }}