refactor(turbo-tasks): Port task statistics to the new backend

[bgw]

This was available on the old memory backend, this ports it to the new backend, which is important now that it's the default.

Plus, the code's cleaner now that the trait resolution hack I had was cleaned up in #75214!

[bgw]

• refactor(turbo-tasks): Port task statistics to the new backend #75303 👈 (View in Graphite)
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[ijjk]

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General

	vercel/next.js canary	vercel/next.js bgw/port-task-statistics	Change
buildDuration	19.5s	16.7s	N/A
buildDurationCached	15.7s	13s	N/A
nodeModulesSize	392 MB	392 MB	✓
nextStartRea..uration (ms)	448ms	439ms	N/A

Client Bundles (main, webpack)

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Rendered Page Sizes

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build cache Overall increase ⚠️

	vercel/next.js canary	vercel/next.js bgw/port-task-statistics	Change
0.pack gzip	2.1 MB	2.1 MB	⚠️ +2.56 kB
index.pack gzip	76 kB	75.1 kB	N/A
Overall change	2.1 MB	2.1 MB	⚠️ +2.56 kB

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Commit: 7b2187b