fix: capture route from base on express app.use

[isikhi]

Closes: #3630

The error mentioned in the issue has been corrected.

Checklist

• Implement code
• Add tests
• Update TypeScript typings
• Update documentation
• Add CHANGELOG.asciidoc entry
• Commit message follows commit guidelines

[cla-checker-service]

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[isikhi]

I signed CLA after the merge request opened, is there any problem with CLA synchronization?

[david-luna]

cla/check

[isikhi]

I signed CLA a few times but could not completed this step idk why. I signed with github related email but i am not sure why it is not completed 🤔 Any help ? Or maybe you can cherry pick my changes these are a few little changes.

[david-luna]

Hi @isikhi

about the CLA you may want to send an email to cla-questions@elastic.co

also I want to ask if you checked my last comment on #3630. The sample you provided has the require('express') before the require('elastic-apm-node').start(...)so that agent is too late to instrument the express framework.

Please confirm you have tested your sample with require('elastic-apm-node').start(...) at the top of the file and see the same behavior. Thanks!