fix(@angular-devkit/build-angular): extract i18n should only show warnings/errors

[clydin]

Fixes #14373

[filipesilva]

Can you check the logging output doesn't cantain other build messages in

angular-cli/packages/angular_devkit/build_angular/test/extract-i18n/works_spec_large.ts

Lines 25 to 41 in 8a34a85

	it('works', async () => {
	host.appendToFile('src/app/app.component.html', '<p i18n>i18n test</p>');
	const run = await architect.scheduleTarget(extractI18nTargetSpec);
	await expectAsync(run.result).toBeResolvedTo(jasmine.objectContaining({ success: true }));
	await run.stop();
	const exists = host.scopedSync().exists(extractionFile);
	expect(exists).toBe(true);
	if (exists) {
	const content = virtualFs.fileBufferToString(host.scopedSync().read(extractionFile));
	expect(content).toContain('i18n test');
	}
	}, 30000);

? This way we would prevent this regression from happening again.

[clydin]

Test added.

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