feat(cli): handle invalid plugin filter options

[hanna-skryl]

Closes #823

This PR improves error handling for --onlyPlugins and --skipPlugins, ensuring the command aborts when no valid plugins are provided to --onlyPlugins. Invalid plugins are ignored with warnings, and conflicts between the two options are handled with clear error messages.

[github-actions]

Code PushUp

🤨 Code PushUp report has both improvements and regressions – compared target commit ed078e1 with source commit cddbdd3.

🕵️ See full comparison in Code PushUp portal 🔍

🏷️ Categories

🏷️ Category	⭐ Previous score	⭐ Current score	🔄 Score change
Performance	🔴 45	🟡 53
Code coverage	🟡 90	🟡 90
Custom checks	🟡 67	🟡 67	–
Security	🟡 87	🟡 87	–
Updates	🟡 78	🟡 78	–
Accessibility	🟢 91	🟢 91	–
Best Practices	🟢 100	🟢 100	–
SEO	🟡 61	🟡 61	–
Bug prevention	🟢 100	🟢 100	–
Code style	🟢 99	🟢 99	–

👍 1 group improved, 👎 1 group regressed, 👍 7 audits improved, 👎 1 audit regressed, 13 audits changed without impacting score

🗃️ Groups

🔌 Plugin	🗃️ Group	⭐ Previous score	⭐ Current score	🔄 Score change
Lighthouse	Performance	🔴 45	🟡 53
Code coverage	Code coverage metrics	🟡 90	🟡 90

18 other groups are unchanged.

🛡️ Audits

🔌 Plugin	🛡️ Audit	📏 Previous value	📏 Current value	🔄 Value change
Lighthouse	First Contentful Paint	🟥 3.5 s	🟨 2.7 s
Lighthouse	First Meaningful Paint	🟨 3.5 s	🟨 2.7 s
Lighthouse	Speed Index	🟥 6.6 s	🟨 5.7 s
Lighthouse	Largest Contentful Paint	🟨 3.9 s	🟨 3.4 s
Lighthouse	Time to Interactive	🟥 16.4 s	🟥 14.9 s
Code coverage	Line coverage	🟩 91.9 %	🟩 91.4 %
Code coverage	Branch coverage	🟨 85 %	🟨 85 %
Code coverage	Function coverage	🟩 92.1 %	🟩 92.2 %
Lighthouse	Avoids enormous network payloads	🟩 Total size was 1,807 KiB	🟩 Total size was 1,795 KiB
Lighthouse	Minimizes main-thread work	🟥 21.2 s	🟥 17.9 s
Lighthouse	Uses efficient cache policy on static assets	🟨 27 resources found	🟨 27 resources found
Lighthouse	JavaScript execution time	🟥 9.9 s	🟥 8.3 s
Lighthouse	Metrics	🟩 100%	🟩 100%
Lighthouse	Total Blocking Time	🟥 7,470 ms	🟥 6,140 ms
Lighthouse	Eliminate render-blocking resources	🟥 Potential savings of 1,460 ms	🟥 Potential savings of 400 ms
Lighthouse	Max Potential First Input Delay	🟥 3,060 ms	🟥 2,350 ms
Lighthouse	Initial server response time was short	🟩 Root document took 460 ms	🟩 Root document took 550 ms
Lighthouse	Network Round Trip Times	🟩 70 ms	🟩 30 ms
Lighthouse	Server Backend Latencies	🟩 120 ms	🟩 100 ms
Lighthouse	Reduce unused CSS	🟥 Potential savings of 71 KiB	🟥 Potential savings of 56 KiB
Lighthouse	Avoids an excessive DOM size	🟥 2,243 elements	🟥 2,249 elements

492 other audits are unchanged.

[matejchalk]

Very well described issue, BTW 👍