Should not warn metadataBase missing if only absolute urls are present

[huozhi]

What

• Narrow down the metadata base warnings only when there's any relative urls need to be resolved, if there's only absolute urls present, no need to resolve and we don't warn.
• Polish the error message, updated from "metadata.metadataBase is not set ..." to "metadataBase property in metadata export is not set ..."

Why

It will be confusing if we're still show metadataBase warning when there's no need to set one, since the social image cards only have absolute urls

Closes NEXT-2426

[ijjk]

Tests Passed

[ijjk]

Stats from current PR

Default Build (Increase detected ⚠️)

General Overall increase ⚠️

	vercel/next.js canary	vercel/next.js fix/metadata-warning	Change
buildDuration	20.3s	20.4s	N/A
buildDurationCached	8.8s	7.8s	N/A
nodeModulesSize	196 MB	196 MB	⚠️ +18 kB
nextStartRea..uration (ms)	413ms	412ms	N/A

Client Bundles (main, webpack)

	vercel/next.js canary	vercel/next.js fix/metadata-warning	Change
1068-HASH.js gzip	30.2 kB	30.3 kB	N/A
3f784ff6-HASH.js gzip	53.5 kB	53.5 kB	N/A
4944-HASH.js gzip	5.04 kB	5.03 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	241 B	240 B	N/A
main-HASH.js gzip	32.1 kB	32.1 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 fix/metadata-warning	Change
polyfills-HASH.js gzip	31 kB	31 kB	✓
Overall change	31 kB	31 kB	✓

Client Pages

	vercel/next.js canary	vercel/next.js fix/metadata-warning	Change
_app-HASH.js gzip	196 B	196 B	✓
_error-HASH.js gzip	184 B	183 B	N/A
amp-HASH.js gzip	503 B	504 B	N/A
css-HASH.js gzip	323 B	324 B	N/A
dynamic-HASH.js gzip	2.5 kB	2.51 kB	N/A
edge-ssr-HASH.js gzip	258 B	259 B	N/A
head-HASH.js gzip	353 B	351 B	N/A
hooks-HASH.js gzip	370 B	370 B	✓
image-HASH.js gzip	4.21 kB	4.2 kB	N/A
index-HASH.js gzip	259 B	259 B	✓
link-HASH.js gzip	2.68 kB	2.67 kB	N/A
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 fix/metadata-warning	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 fix/metadata-warning	Change
index.html gzip	529 B	529 B	✓
link.html gzip	541 B	541 B	✓
withRouter.html gzip	525 B	524 B	N/A
Overall change	1.07 kB	1.07 kB	✓

Edge SSR bundle Size Overall increase ⚠️

	vercel/next.js canary	vercel/next.js fix/metadata-warning	Change
edge-ssr.js gzip	94.4 kB	94.5 kB	N/A
page.js gzip	151 kB	151 kB	⚠️ +137 B
Overall change	151 kB	151 kB	⚠️ +137 B

Middleware size

	vercel/next.js canary	vercel/next.js fix/metadata-warning	Change
middleware-b..fest.js gzip	626 B	625 B	N/A
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	2.1 kB	2.1 kB	✓

Next Runtimes

	vercel/next.js canary	vercel/next.js fix/metadata-warning	Change
app-page-exp...dev.js gzip	166 kB	166 kB	N/A
app-page-exp..prod.js gzip	95.6 kB	95.6 kB	N/A
app-page-tur..prod.js gzip	97.3 kB	97.3 kB	N/A
app-page-tur..prod.js gzip	91.8 kB	91.8 kB	N/A
app-page.run...dev.js gzip	136 kB	136 kB	N/A
app-page.run..prod.js gzip	90.3 kB	90.3 kB	N/A
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	✓
app-route-tu..prod.js gzip	14.6 kB	14.6 kB	✓
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	248 kB	248 kB	✓

build cache

	vercel/next.js canary	vercel/next.js fix/metadata-warning	Change
0.pack gzip	1.55 MB	1.55 MB	N/A
index.pack gzip	103 kB	103 kB	N/A
Overall change	0 B	0 B	✓

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Commit: 7ab9abb