fix: astro island urls missing assetsPrefix in SSR mode

[jcdogo]

Changes

• Fixes assetsPrefix is not prepended to astro island component-url and renderer-url #6852
• In SSR mode, assetsPrefix is not being prepended to component-url and renderer-url.

Testing

We added a test to astro/test/astro-assets-prefix.test.js.

it('react component astro-island should import from assetsPrefix', async () => {
	const request = new Request('https://example.com/custom-base/');
	const response = await app.render(request);
	expect(response.status).to.equal(200);
	const html = await response.text();
	const $ = cheerio.load(html);
	const island = $('astro-island');
	expect(island.attr('component-url')).to.match(assetsPrefixRegex);
	expect(island.attr('renderer-url')).to.match(assetsPrefixRegex);
});

A similar test case already existed for the SSG case, but not for SSR. I just copied and adapted the test case for SSR. When the test case was added for SSR, it was failing until we implemented the fix.

Docs

This change should not really affect the user's behavior since it is a bug fix.

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[bluwy]

Thanks for the fix!