refactor(plugin-js-packages): use build-md to format issue messages

[matejchalk]

Follow-up from #755.

[github-actions]

Code PushUp

🤨 Code PushUp report has both improvements and regressions – compared target commit 1e3da59 with source commit 4df1fc2.

🕵️ See full comparison in Code PushUp portal 🔍

🏷️ Categories

🏷️ Category	⭐ Previous score	⭐ Current score	🔄 Score change
Performance	🟡 56	🔴 43
Code coverage	🟡 90	🟡 90
Custom checks	🟡 67	🟡 67	–
Security	🟢 100	🟢 100	–
Updates	🟡 78	🟡 78	–
Accessibility	🟢 91	🟢 91	–
Best Practices	🟢 100	🟢 100	–
SEO	🟡 61	🟡 61	–
Bug prevention	🟢 100	🟢 100	–
Code style	🟢 99	🟢 99	–

🗃️ Groups

👎 2 groups regressed

🔌 Plugin	🗃️ Group	⭐ Previous score	⭐ Current score	🔄 Score change
Lighthouse	Performance	🟡 56	🔴 43
Code coverage	Code coverage metrics	🟡 90	🟡 90

18 other groups are unchanged.

🛡️ Audits

👍 1 audit improved, 👎 6 audits regressed, 14 audits changed without impacting score

🔌 Plugin	🛡️ Audit	📏 Previous value	📏 Current value	🔄 Value change
Lighthouse	Largest Contentful Paint	🟨 2.8 s	🟥 4.0 s
Lighthouse	Speed Index	🟥 5.9 s	🟥 8.0 s
Lighthouse	First Contentful Paint	🟨 2.7 s	🟥 3.3 s
Lighthouse	First Meaningful Paint	🟨 2.7 s	🟨 3.3 s
Lighthouse	Time to Interactive	🟥 16.7 s	🟥 17.0 s
Code coverage	Function coverage	🟩 92.2 %	🟩 92.1 %
Code coverage	Branch coverage	🟨 83.9 %	🟨 83.9 %
Lighthouse	Avoids enormous network payloads	🟩 Total size was 1,784 KiB	🟩 Total size was 1,790 KiB
Lighthouse	Minimizes main-thread work	🟥 20.4 s	🟥 24.3 s
Lighthouse	Total Blocking Time	🟥 7,420 ms	🟥 8,840 ms
Lighthouse	JavaScript execution time	🟥 9.8 s	🟥 10.7 s
Lighthouse	Max Potential First Input Delay	🟥 2,810 ms	🟥 3,600 ms
Lighthouse	Eliminate render-blocking resources	🟥 Potential savings of 740 ms	🟥 Potential savings of 1,430 ms
Lighthouse	Metrics	🟩 16721	🟩 16999
Lighthouse	Uses efficient cache policy on static assets	🟨 27 resources found	🟨 27 resources found
Lighthouse	Initial server response time was short	🟩 Root document took 430 ms	🟩 Root document took 360 ms
Lighthouse	Server Backend Latencies	🟩 130 ms	🟩 80 ms
Lighthouse	Reduce unused CSS	🟥 Potential savings of 105 KiB	🟥 Potential savings of 105 KiB
Lighthouse	Network Round Trip Times	🟩 30 ms	🟩 10 ms
JS Packages	Outdated NPM dev dependencies.	🟨 54 outdated package versions (29 major, 19 minor, 5 patch, 1 prerelease)	🟨 55 outdated package versions (29 major, 20 minor, 5 patch, 1 prerelease)
Code coverage	Line coverage	🟩 91.2 %	🟩 91.2 %

488 other audits are unchanged.

[BioPhoton]

Nice reduction of the code and also better formatted! 👍

We could move the issue parsing into a separate helper. (Just a suggestion, no requirement)

[Tlacenka]

Much more readable, thank you 🙏

I found one grammatical issue, see below.