Embedded image render hook does not honor markdown attributes

[jmooring]

Reference: https://discourse.gohugo.io/t/image-block-attribute-disappears-with-0-123-x/48677

Test case:

func TestFoo(t *testing.T) {
	t.Parallel()

	files := `
-- config.toml --
disableKinds = ['page','rss','section','sitemap','taxonomy','term']

[markup.goldmark.parser]
wrapStandAloneImageWithinParagraph = false

[markup.goldmark.parser.attribute]
block = true

[languages.en]
# weight = 1
-- content/_index.md --
![alt](a.jpg)
{.foo}
-- layouts/index.html --
{{ .Content }}
`

	b := hugolib.Test(t, files)
	b.AssertFileContent("public/index.html", `<img src="a.jpg" alt="alt" class="foo">`)

	files = strings.Replace(files, "# weight", "weight", -1)

	b = hugolib.Test(t, files)
	b.AssertFileContent("public/index.html", `<img src="a.jpg" alt="alt" class="foo">`) // failing test
}

[github-actions]

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