Add test to deal with 5 layers of slot forwarding and defaults

test/runtime/samples/slot-forwarding-default-5-layers-deep/Component1.svelte

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+<script>
+	import Component2 from './Component2.svelte';
+</script>
+
+<Component2>
+	<slot name="first" slot="first" />
+	<slot name="second" slot="second">
+    <h3>Component 2 second default slot</h3>
+  </slot>
+	<slot name="third" slot="third" />
+	<slot name="fourth" slot="fourth" />
+	<slot name="fifth" slot="fifth" />
+</Component2>

test/runtime/samples/slot-forwarding-default-5-layers-deep/Component2.svelte

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+<script>
+	import Component3 from './Component3.svelte';
+</script>
+
+<Component3>
+	<slot name="first" slot="first" />
+	<slot name="second" slot="second" />
+	<slot name="third" slot="third">
+    <h3>Component 3 third default slot</h3>
+  </slot>
+	<slot name="fourth" slot="fourth" />
+	<slot name="fifth" slot="fifth" />
+</Component3>

test/runtime/samples/slot-forwarding-default-5-layers-deep/Component3.svelte

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+<script>
+	import Component4 from './Component4.svelte';
+</script>
+
+<Component4>
+	<slot name="first" slot="first" />
+	<slot name="second" slot="second" />
+	<slot name="third" slot="third" />
+	<slot name="fourth" slot="fourth">
+    <h3>Component 4 fourth default slot</h3>
+  </slot>
+	<slot name="fifth" slot="fifth" />
+</Component4>

test/runtime/samples/slot-forwarding-default-5-layers-deep/Component4.svelte

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+<slot name="first">First slot's default text</slot>
+<slot name="second">Second slot's default text</slot>
+<slot name="third">Third slot's default text</slot>
+<slot name="fourth">Fourth slot's default text</slot>
+<slot name="fifth">Fifth slot's default text</slot>

test/runtime/samples/slot-forwarding-default-5-layers-deep/_config.js

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+export default {
+	html: `
+		<h3 slot="first">First slot</h3>
+		<h3>Component 2 second default slot</h3>
+		<h3>Component 3 third default slot</h3>
+		<h3>Component 4 fourth default slot</h3>
+		Fifth slot's default text
+	`
+};

test/runtime/samples/slot-forwarding-default-5-layers-deep/main.svelte

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+<script>
+	import Component1 from './Component1.svelte';
+</script>
+
+<Component1>
+	<h3 slot="first">First slot</h3>
+</Component1>