[Next.js] Switch _Pages Router_ serverside performance instrumentation over to OTEL

[lforst]

Description

Switching to OTEL for all the different data fetchers like gSSP and gIP is necessary for the move to Turbopack.

Ref: #8105

[lforst]

Things to test:

Feature	next@13 node	next@14 node	next@15 node	next@13 edge	next@14 edge	next@15 edge
Creates well-named overarching http.server span for pages
Creates span for getServerSideProps
Creates span for getInitialProps in Page
Creates span for getInitialProps in _app
Creates span for getInitialProps in _document
Creates span for getInitialProps in _error