[4.x] Fixes Antlers Sections not being yieldable in Blade layouts

[JohnathonKoster]

This PR corrects an issue with Antlers sections not being yieldable in Blade layouts. The render method here https://github.com/statamic/cms/blob/4.x/src/View/View.php#L100 flushes the sections. The changes here put them back before rendering the layout.

After this, the following will now work again:

layout.blade.php

@yield('the_section')

template.antlers.html

{{ section:the_section }}
The section contents.
{{ /section:the_section }}

[jasonvarga]

This renders escaped html. Did it always do that?

{{ section:the_section }}
<p class="foo">The section contents.</p>
{{ /section:the_section }}

would yield

<p class="foo">The section contents.</p>

[JohnathonKoster]

bah. you're right. I was trying to avoid the start/stopSection calls and didn't catch the subtle behavior difference when passing in the content directly. I've wrapped them in HtmlString now. Side note: I was having quite a few challenges getting Blade layouts to work within the test suite to add a test for this