next.js

2912b107 - OTel: use `srcPage` for templates when `next.route` is unavailable (#83911)

OTel: use `srcPage` for templates when `next.route` is unavailable (#83911) ### Why? srcPage is relatively lower cardinality, so use this if available. In the base-server handleRequest, it is the entry of the request, so no low-cardinality target is available. https://github.com/vercel/next.js/pull/75416/files#diff-6f4291cc2bfc5073fdca12a014011769e840ee68583db1468acef075f037015aR891