Rename internal utility naming for clarification

[shuding]

createActionProxy isn't the accurate name here - the function doesn't return anything new but only mark the value as registered. And also, it might not be a proxy (which is implementation detail) and might not be used for Server Actions only. registerServerReference is a better name here.

There's no functionality change in this PR, only a few renames.

Closes NEXT-2490

[ijjk]

Tests Passed

[ijjk]

Stats from current PR

Default Build

General Overall increase ⚠️

	vercel/next.js canary	vercel/next.js shu/8xwc	Change
buildDuration	20s	20.3s	⚠️ +303ms
buildDurationCached	8.7s	7.5s	N/A
nodeModulesSize	196 MB	196 MB	⚠️ +442 B
nextStartRea..uration (ms)	425ms	429ms	N/A

Client Bundles (main, webpack)

	vercel/next.js canary	vercel/next.js shu/8xwc	Change
1068-HASH.js gzip	30 kB	30 kB	N/A
3f784ff6-HASH.js gzip	53.5 kB	53.5 kB	N/A
4944-HASH.js gzip	4.96 kB	4.96 kB	N/A
8423.HASH.js gzip	181 B	181 B	✓
framework-HASH.js gzip	45.2 kB	45.2 kB	✓
main-app-HASH.js gzip	240 B	241 B	N/A
main-HASH.js gzip	32 kB	32 kB	N/A
webpack-HASH.js gzip	1.7 kB	1.7 kB	✓
Overall change	47.1 kB	47.1 kB	✓

Legacy Client Bundles (polyfills)

	vercel/next.js canary	vercel/next.js shu/8xwc	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

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head-HASH.js gzip	353 B	351 B	N/A
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routerDirect..HASH.js gzip	313 B	314 B	N/A
script-HASH.js gzip	386 B	385 B	N/A
withRouter-HASH.js gzip	309 B	311 B	N/A
1afbb74e6ecf..834.css gzip	106 B	106 B	✓
Overall change	931 B	931 B	✓

Client Build Manifests

	vercel/next.js canary	vercel/next.js shu/8xwc	Change
_buildManifest.js gzip	485 B	484 B	N/A
Overall change	0 B	0 B	✓

Rendered Page Sizes

	vercel/next.js canary	vercel/next.js shu/8xwc	Change
index.html gzip	529 B	527 B	N/A
link.html gzip	541 B	540 B	N/A
withRouter.html gzip	525 B	522 B	N/A
Overall change	0 B	0 B	✓

Edge SSR bundle Size

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edge-ssr.js gzip	94.4 kB	94.4 kB	N/A
page.js gzip	151 kB	151 kB	N/A
Overall change	0 B	0 B	✓

Middleware size

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middleware-b..fest.js gzip	625 B	625 B	✓
middleware-r..fest.js gzip	151 B	151 B	✓
middleware.js gzip	44.4 kB	44.4 kB	N/A
edge-runtime..pack.js gzip	1.94 kB	1.94 kB	✓
Overall change	2.72 kB	2.72 kB	✓

Next Runtimes

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app-page-exp..prod.js gzip	95.5 kB	95.5 kB	✓
app-page-tur..prod.js gzip	97.2 kB	97.2 kB	✓
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app-page.run...dev.js gzip	136 kB	136 kB	✓
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app-route-ex...dev.js gzip	22 kB	22 kB	✓
app-route-ex..prod.js gzip	14.9 kB	14.9 kB	✓
app-route-tu..prod.js gzip	14.9 kB	14.9 kB	✓
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app-route.ru...dev.js gzip	21.7 kB	21.7 kB	✓
app-route.ru..prod.js gzip	14.6 kB	14.6 kB	✓
pages-api-tu..prod.js gzip	9.43 kB	9.43 kB	✓
pages-api.ru...dev.js gzip	9.7 kB	9.7 kB	✓
pages-api.ru..prod.js gzip	9.43 kB	9.43 kB	✓
pages-turbo...prod.js gzip	22 kB	22 kB	✓
pages.runtim...dev.js gzip	22.7 kB	22.7 kB	✓
pages.runtim..prod.js gzip	22 kB	22 kB	✓
server.runti..prod.js gzip	50 kB	50 kB	✓
Overall change	925 kB	925 kB	✓

build cache

	vercel/next.js canary	vercel/next.js shu/8xwc	Change
0.pack gzip	1.55 MB	1.55 MB	N/A
index.pack gzip	104 kB	103 kB	N/A
Overall change	0 B	0 B	✓

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Commit: a923cb3