fix flakey app-action test

[ztanner]

This test is flaking because the assertion before it triggers a redbox error, and the HMR event to remove the redbox is occasionally happening after we've moved onto the next test assertion. It also just checks for "h1" which is heavily overloaded in this test suite for various UI elements so I added a more specific selector.

x-ref

Closes NEXT-2756

[ztanner]

• fix flakey HMR test #63022
• fix flakey app-action test #63021 👈
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Tests Passed

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General

	vercel/next.js canary	vercel/next.js 03-07-fix_flakey_app-action_test	Change
buildDuration	13.7s	13.7s	N/A
buildDurationCached	7.3s	6.1s	N/A
nodeModulesSize	198 MB	198 MB	✓
nextStartRea..uration (ms)	429ms	434ms	N/A

Client Bundles (main, webpack)

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Edge SSR bundle Size

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build cache

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Overall change	0 B	0 B	✓

Diff details

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Commit: 9f592e8