Trim trailing newlines for normal blockquotes too, to mirror callout blockquotes

[Winterhuman]

What version of Hugo are you using (hugo version)?

hugo v0.142.0+extended+withdeploy linux/amd64 BuildDate=unknown

Description

Related: #13301

Currently, trailing newlines are removed from blockquotes with callouts, but are kept for normal blockquotes, e.g.

<blockquote>
	<p>Example</p>

</blockquote>

<blockquote>
	<p>Example</p>
</blockquote>

This is slightly confusing (in that sense that it's unintuitive why they'd differ), even if easy enough to mitigate by reimplementing the trimming in the render-blockquotes.html file, so it'd be nice if both types of blockquotes mirrored each other for more consistent HTML output. It's pretty minor, but without a built-in way to prettify HTML in Hugo (related issue: #7190), it is something users will need to keep in mind when wanting to achieve clean & mostly reproducible output

[Winterhuman]

Apologies in advance if this is more a proposal; I wasn't sure if the fact the behaviour was different in the past would make it count as a bug or an enhancement

[jmooring]

Accepting this proposal.

[github-actions]

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