fix(nextjs): Fix matching logic for file convention type for root level components

[lforst]

We had some instances of unknown page server component being recorded because we were passing page.tsx instead of /page.tsx to the matching regex and the regex always matched for a leading slash.

[codecov]

❌ 8 Tests Failed:

Tests completed	Failed	Passed	Skipped
232	8	224	4

View the top 3 failed tests by shortest run time

server-components.test.ts Should set a "not_found" status on a server component span when notFound() is called and the request span should have status ok

Stack Traces | 0.236s run time

server-components.test.ts:69:5 Should set a "not_found" status on a server component span when notFound() is called and the request span should have status ok

generation-functions.test.ts Should send a transaction and an error event for a faulty generateViewport() function invokation

Stack Traces | 0.243s run time

generation-functions.test.ts:86:5 Should send a transaction and an error event for a faulty generateViewport() function invokation

server/server-component-error.test.ts Should capture an error thrown in a server component

Stack Traces | 0.281s run time

server-component-error.test.ts:4:5 Should capture an error thrown in a server component

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