Fix: DateTimePicker styles don't load as expected outside WordPress context #15389
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Closes: #8870
I started this PR with the objective of closing #8870 which is a very old issue. Meanwhile, I noticed the arrow styles referenced on the issue were already fixed, but the component still had some styling problems outside WordPress this PR fixes these problems.
Before:
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After:

How has this been tested?
I pasted the following gist https://gist.github.com/jorgefilipecosta/6e55059202ccbcb683a56f0546ea6f93 on playground/src/index.js.
I executed the playground and verified the DateTimePicker component appears with the same look as it appears inside WordPress context e.g: the post scheduler.