[APMAPI-1618] Only show diff in typing stats

[vpellan]

What does this PR do?

It only show the diff between base branch and current branch for typing stats

Motivation:

It will add more value to the typing stats comment

Change log entry

None.

Additional Notes:

How to test the change?

When it will be ready, it should display a comment saying there is no changes. You'll be able to see the changes through the edit history of that comment

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-10-17 08:45:30

Comparing candidate commit 73cae16 in PR branch vpellan/typing-stats-diff with baseline commit c5e3981 in branch master.

Found 2 performance improvements and 0 performance regressions! Performance is the same for 42 metrics, 2 unstable metrics.

scenario:error - error tracking, with_error=false - user code only

• 🟩 throughput [+616.043op/s; +664.721op/s] or [+5.262%; +5.678%]

scenario:error - error tracking, with_error=true - all

• 🟩 throughput [+561.794op/s; +583.443op/s] or [+8.580%; +8.911%]

[github-actions]

Typing analysis

This PR does not change typing compared to the base branch.

[datadog-official]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage
• Patch Coverage: 100.00%
• Total Coverage: 98.59% (+0.03%)

View detailed report

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: 73cae16 | Docs | Was this helpful? Give us feedback!}

[marcotc]

This is amazing! It makes it so clear what type changes happened!

[Strech]

👏🏼 Well done!