fix(utils): replace misleading commit labels in markdown diff

[matejchalk]

The source and target terminology was the wrong way around 🤦‍♂️ Replaced with current and previous, which is clearer.

[github-actions]

Code PushUp

😟 Code PushUp report has regressed – compared current commit 05af3f4 with previous commit 070d4de.

🕵️ See full comparison in Code PushUp portal 🔍

🏷️ Categories

🏷️ Category	⭐ Previous score	⭐ Current score	🔄 Score change
Performance	🟡 52	🔴 48
Code coverage	🟢 91	🟢 91	–
Security	🟡 75	🟡 75	–
Updates	🟡 77	🟡 77	–
Accessibility	🟢 92	🟢 92	–
Best Practices	🟢 100	🟢 100	–
SEO	🟡 61	🟡 61	–
Bug prevention	🟢 100	🟢 100	–
Code style	🟢 100	🟢 100	–
Documentation	🔴 23	🔴 23	–

👎 1 group regressed, 👎 4 audits regressed, 12 audits changed without impacting score

🗃️ Groups

🔌 Plugin	🗃️ Group	⭐ Previous score	⭐ Current score	🔄 Score change
Lighthouse	Performance	🟡 52	🔴 48

17 other groups are unchanged.

🛡️ Audits

🔌 Plugin	🛡️ Audit	📏 Previous value	📏 Current value	🔄 Value change
Lighthouse	Speed Index	🟨 5.2 s	🟥 7.3 s
Lighthouse	First Contentful Paint	🟨 2.8 s	🟨 3.0 s
Lighthouse	Time to Interactive	🟥 13.5 s	🟥 14.9 s
Lighthouse	Total Blocking Time	🟥 3,060 ms	🟥 6,560 ms
Lighthouse	Minimizes main-thread work	🟥 13.6 s	🟥 19.8 s
Lighthouse	JavaScript execution time	🟥 6.7 s	🟥 8.3 s
Lighthouse	Metrics	🟩 100%	🟩 100%
Lighthouse	Max Potential First Input Delay	🟥 1,640 ms	🟥 2,640 ms
Lighthouse	Uses efficient cache policy on static assets	🟨 27 resources found	🟨 27 resources found
Lighthouse	Server Backend Latencies	🟩 460 ms	🟩 120 ms
Lighthouse	Eliminate render-blocking resources	🟥 Potential savings of 870 ms	🟥 Potential savings of 650 ms
Lighthouse	Reduce unused CSS	🟥 Potential savings of 67 KiB	🟥 Potential savings of 67 KiB
Lighthouse	Initial server response time was short	🟩 Root document took 350 ms	🟩 Root document took 510 ms
Lighthouse	Avoids enormous network payloads	🟩 Total size was 1,822 KiB	🟩 Total size was 1,822 KiB
Lighthouse	Largest Contentful Paint	🟨 3.7 s	🟨 3.7 s
Lighthouse	Network Round Trip Times	🟩 30 ms	🟩 20 ms

580 other audits are unchanged.