perf(plugin-eslint): lint nx projects in separate processes

[matejchalk]

Closes #629

Tested by executing plugin from dist on code-pushup/portal. Previously, this would crash without NODE_OPTIONS=--max-old-space-size=8192. Now it successfully completes without any memory increase.

Also created follow-up issue for further optimization:

• Run ESLint in parallel for multiple Nx projects #652

[nx-cloud]

☁️ Nx Cloud Report

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✅ Successfully ran 5 targets

• nx release --yes --dry-run
• nx affected -t integration-test --parallel=3 --coverage.enabled
• nx affected -t unit-test --parallel=3 --coverage.enabled
• nx affected:lint --parallel=3
• nx affected:build --parallel=3

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Sent with 💌 from NxCloud.

[github-actions]

Code PushUp

🤨 Code PushUp report has both improvements and regressions – compared target commit 41a95b0 with source commit b2a180e.

🏷️ Categories

🏷️ Category	⭐ Current score	⭐ Previous score	🔄 Score change
Performance	🟡 87	🟡 64
Code coverage	🟡 67	🟡 67
Updates	🟡 69	🟡 69
Accessibility	🟢 100	🟢 100	–
Best Practices	🟢 100	🟢 100	–
SEO	🟡 86	🟡 86	–
PWA	🟡 63	🟡 63	–
Bug prevention	🟢 100	🟢 100	–
Code style	🟢 99	🟢 99	–
Security	🟡 80	🟡 80	–
Custom checks	🟡 67	🟡 67	–

🗃️ Groups

👍 3 groups improved

🔌 Plugin	🗃️ Group	⭐ Current score	⭐ Previous score	🔄 Score change
Lighthouse	Performance	🟡 87	🟡 64
Code coverage	Code coverage metrics	🟡 67	🟡 67
JS Packages	NPM outdated dependencies	🟡 69	🟡 69

18 other groups are unchanged.

🛡️ Audits

👍 10 audits improved, 👎 1 audit regressed, 8 audits changed without impacting score

🔌 Plugin	🛡️ Audit	📏 Current value	📏 Previous value	🔄 Value change
Lighthouse	Total Blocking Time	🟨 320 ms	🟥 1,330 ms
Lighthouse	First Contentful Paint	🟩 1.3 s	🟨 2.4 s
Lighthouse	Speed Index	🟩 1.8 s	🟨 4.1 s
Lighthouse	Max Potential First Input Delay	🟥 400 ms	🟥 820 ms
Lighthouse	First Meaningful Paint	🟩 1.3 s	🟨 2.4 s
Lighthouse	Time to Interactive	🟩 3.2 s	🟨 4.4 s
Lighthouse	Largest Contentful Paint	🟨 3.1 s	🟨 3.0 s
JS Packages	Outdated NPM dev dependencies.	🟥 45 outdated package versions (25 major, 14 minor, 6 patch)	🟥 44 outdated package versions (25 major, 14 minor, 5 patch)
Code coverage	Function coverage	🟨 60 %	🟨 59 %
Code coverage	Line coverage	🟨 65 %	🟨 65 %
Code coverage	Branch coverage	🟨 82 %	🟨 82 %
Lighthouse	Minimizes main-thread work	🟥 2.9 s	🟥 6.0 s
Lighthouse	Properly size images	🟥 Potential savings of 327 KiB	🟥 Potential savings of 327 KiB
Lighthouse	Metrics	🟩 3183	🟩 4410
Lighthouse	JavaScript execution time	🟩 0.8 s	🟩 1.3 s
Lighthouse	Avoids enormous network payloads	🟩 Total size was 467 KiB	🟩 Total size was 467 KiB
Lighthouse	Uses efficient cache policy on static assets	🟨 14 resources found	🟨 14 resources found
Lighthouse	Server Backend Latencies	🟩 30 ms	🟩 30 ms
Lighthouse	Network Round Trip Times	🟩 0 ms	🟩 0 ms

504 other audits are unchanged.

[Tlacenka]

I like this improvement a lot!

I looked both at the plugin code and the tests.
While there are some generic tests and bigger snapshots of higher complexity, their refactor does not belong to this PR.