feat(plugin-eslint): add exclude option for Nx projects

[hanna-skryl]

Closes #496

This PR adds an exclude option to the eslintConfigFromAllNxProjects function, allowing Nx projects to be selectively excluded from ESLint configuration and additionally moves the toProjectGraph helper into test-utils for reuse across test suites.

[github-actions]

Code PushUp

🤨 Code PushUp report has both improvements and regressions – compared target commit 13f3787 with source commit d8a7eb2.

🕵️ See full comparison in Code PushUp portal 🔍

🏷️ Categories

🏷️ Category	⭐ Previous score	⭐ Current score	🔄 Score change
Performance	🟡 56	🟡 55
Code coverage	🟡 90	🟡 90
Custom checks	🟡 67	🟡 67	–
Security	🟡 83	🟡 83	–
Updates	🟡 76	🟡 76	–
Accessibility	🟢 91	🟢 91	–
Best Practices	🟢 100	🟢 100	–
SEO	🟡 61	🟡 61	–
Bug prevention	🟢 100	🟢 100	–
Code style	🟢 100	🟢 100	–

👎 2 groups regressed, 👍 4 audits improved, 👎 2 audits regressed, 16 audits changed without impacting score

🗃️ Groups

🔌 Plugin	🗃️ Group	⭐ Previous score	⭐ Current score	🔄 Score change
Lighthouse	Performance	🟡 56	🟡 55
Code coverage	Code coverage metrics	🟡 90	🟡 90

18 other groups are unchanged.

🛡️ Audits

🔌 Plugin	🛡️ Audit	📏 Previous value	📏 Current value	🔄 Value change
Lighthouse	Largest Contentful Paint	🟨 2.8 s	🟨 3.1 s
Lighthouse	First Contentful Paint	🟨 2.8 s	🟨 2.8 s
Lighthouse	First Meaningful Paint	🟨 2.8 s	🟨 2.8 s
Lighthouse	Time to Interactive	🟥 16.5 s	🟥 15.7 s
Code coverage	Line coverage	🟩 90.7 %	🟩 90.4 %
Code coverage	Function coverage	🟩 92.4 %	🟩 92.4 %
Lighthouse	Uses efficient cache policy on static assets	🟨 27 resources found	🟨 27 resources found
Lighthouse	Avoids enormous network payloads	🟩 Total size was 1,813 KiB	🟩 Total size was 1,815 KiB
Lighthouse	Max Potential First Input Delay	🟥 3,190 ms	🟥 1,710 ms
Lighthouse	Minimizes main-thread work	🟥 16.9 s	🟥 18.2 s
Lighthouse	Total Blocking Time	🟥 5,680 ms	🟥 6,790 ms
Lighthouse	Metrics	🟩 100%	🟩 100%
Lighthouse	Eliminate render-blocking resources	🟥 Potential savings of 570 ms	🟥 Potential savings of 1,190 ms
Lighthouse	JavaScript execution time	🟥 9.9 s	🟥 9.5 s
Lighthouse	Reduce unused CSS	🟥 Potential savings of 56 KiB	🟥 Potential savings of 70 KiB
Lighthouse	Server Backend Latencies	🟩 240 ms	🟩 100 ms
Lighthouse	Initial server response time was short	🟩 Root document took 410 ms	🟩 Root document took 350 ms
Lighthouse	Network Round Trip Times	🟩 60 ms	🟩 30 ms
Lighthouse	Speed Index	🟥 5.9 s	🟥 5.9 s
JS Packages	Outdated NPM dev dependencies.	🟨 45 outdated package versions (26 major, 14 minor, 1 preminor, 4 patch)	🟨 46 outdated package versions (26 major, 15 minor, 1 preminor, 4 patch)
Lighthouse	Avoids an excessive DOM size	🟥 2,232 elements	🟥 2,231 elements
Code coverage	Branch coverage	🟨 84.8 %	🟨 84.8 %

491 other audits are unchanged.