fix(node): Adjust Express URL parameterization for array routes

[Lms24]

This PR fixes an error thrown from our Node SDK that when our Express router parameterization logic (introduced in #5450) would try to parameterize a route consisting of an array of paths (which could be strings or RegExes).

Previously, before #5450, the transaction name for a route such as

app.get(['/test/array1', /\/test\/array[2-9]/], (_req, res) => {});

would be GET /test/array1,/\/test\/array[2-9]/. This is because internally, express does not care about which item in the array matched successfully. Express simply combines all items into one regex and matches the incoming path against this regex. It then stores the whole, concatenated array as the matched route.

While it might be worth revisiting our transaction name strategy for array routes at a later time, this is out of scope for this PR and the bugfix. Therefore, transaction names (for now) stay the same but, the patch fixes the error that was thrown as well as adding URL parameterization in time for DSC population (well, mostly; see #5450 for more details on that).

Since a crucial part of our parameterization approach is to determine if the currently resolved layer is the "last" part of the route (in which case we update the transaction name and source), this patch also makes a few modifications to determine this correctly for arrays. In order to do so, we check for the number of URL segments in the original URL vs. that of the parameterized URL. In the case of arrays, we'll likely have more segments than in the raw URL path. Therefore, we balance this out by determining the number of extra segments we got from the array.

Additionally, added tests for array routes.

fixes #5489

[github-actions]

size-limit report 📦

Path	Size
@sentry/browser - ES5 CDN Bundle (gzipped + minified)	19.36 KB (+0.02% 🔺)
@sentry/browser - ES5 CDN Bundle (minified)	59.92 KB (0%)
@sentry/browser - ES6 CDN Bundle (gzipped + minified)	17.93 KB (-0.01% 🔽)
@sentry/browser - ES6 CDN Bundle (minified)	52.79 KB (0%)
@sentry/browser - Webpack (gzipped + minified)	19.69 KB (0%)
@sentry/browser - Webpack (minified)	64.13 KB (0%)
@sentry/react - Webpack (gzipped + minified)	19.71 KB (0%)
@sentry/nextjs Client - Webpack (gzipped + minified)	44.11 KB (0%)
@sentry/browser + @sentry/tracing - ES5 CDN Bundle (gzipped + minified)	25.76 KB (0%)
@sentry/browser + @sentry/tracing - ES6 CDN Bundle (gzipped + minified)	24.01 KB (+0.01% 🔺)