Separate flaky test to separate mpa navigation test

[huozhi]

x-ref: https://github.com/vercel/next.js/actions/runs/8027024931/job/21930458742?pr=62456
x-ref: https://github.com/vercel/next.js/actions/runs/8024818257/job/21924166225?pr=62448

separate the test into new production test and use retry to wait. But still flaky. Will tackle in other PRs

Closes NEXT-2585

[ijjk]

Stats from current PR

Default Build (Increase detected ⚠️)

General

	vercel/next.js canary	vercel/next.js test/flaky-test	Change
buildDuration	14.2s	13.9s	N/A
buildDurationCached	7.6s	6.5s	N/A
nodeModulesSize	197 MB	197 MB	✓
nextStartRea..uration (ms)	416ms	410ms	N/A

Client Bundles (main, webpack)

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Overall change	47.1 kB	47.1 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	vercel/next.js test/flaky-test	Change
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Client Build Manifests

	vercel/next.js canary	vercel/next.js test/flaky-test	Change
_buildManifest.js gzip	485 B	484 B	N/A
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Rendered Page Sizes

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link.html gzip	541 B	541 B	✓
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Edge SSR bundle Size

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Middleware size

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edge-runtime..pack.js gzip	839 B	839 B	✓
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Next Runtimes

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pages.runtim..prod.js gzip	22.3 kB	22.3 kB	✓
server.runti..prod.js gzip	50.5 kB	50.5 kB	✓
Overall change	950 kB	950 kB	✓

build cache Overall increase ⚠️

	vercel/next.js canary	vercel/next.js test/flaky-test	Change
0.pack gzip	1.55 MB	1.56 MB	⚠️ +829 B
index.pack gzip	105 kB	104 kB	N/A
Overall change	1.55 MB	1.56 MB	⚠️ +829 B

Commit: ae14e8c

[ijjk]

Tests Passed

[huozhi]

Close in favor of the fix in #62383