Specify PPR test dimension via environment variable only

[eps1lon]

We can create separate Jest projects instead if there's a desire to run a test with and without PPR.
But in this current state, the test was executed twice for each PPR state:
once in the PPR CI shard with PPR enabled and once in the non-PPR CI shard with PPR enabled

[eps1lon]

• Specify PPR test dimension via environment variable only #74031 👈 (View in Graphite)
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[ijjk]

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[ijjk]

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General

	vercel/next.js canary	vercel/next.js sebbie/12-17-specify_ppr_test_dimension_via_environment_variable_only	Change
buildDuration	20s	23.7s	⚠️ +3.7s
buildDurationCached	15.8s	13.5s	N/A
nodeModulesSize	410 MB	410 MB	N/A
nextStartRea..uration (ms)	488ms	490ms	N/A

Client Bundles (main, webpack)

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Edge SSR bundle Size

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edge-ssr.js gzip	128 kB	128 kB	N/A
page.js gzip	204 kB	204 kB	N/A
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Middleware size

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build cache Overall increase ⚠️

	vercel/next.js canary	vercel/next.js sebbie/12-17-specify_ppr_test_dimension_via_environment_variable_only	Change
0.pack gzip	2.06 MB	2.06 MB	N/A
index.pack gzip	71.5 kB	73 kB	⚠️ +1.49 kB
Overall change	71.5 kB	73 kB	⚠️ +1.49 kB

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Commit: b77d0c8