Fix (Glimmer): avoid unwanted whitespace in components

[GavinJoyce]

This fixes an issue where unwanted white space was being added to components.

With the following input:

<div>
  <UserGreeting
    @aVeryLongArgumentNameThatIsStillGoing={{@alsoAVeryLongArgument}}
  />
</div>

before this PR: (note the extra before the /> and the extra line break)

<div>
  <UserGreeting
    @aVeryLongArgumentNameThatIsStillGoing={{@alsoAVeryLongArgument}}
   />

</div>

after this PR:

<div>
  <UserGreeting
    @aVeryLongArgumentNameThatIsStillGoing={{@alsoAVeryLongArgument}}
  />
</div>

• I’ve added tests to confirm my change works.
• (If changing the API or CLI) I’ve documented the changes I’ve made (in the docs/ directory)
• (If the change is user-facing) I’ve added my changes to the CHANGELOG.unreleased.md file following the template.
• I’ve read the contributing guidelines.

✨Try the playground for this PR✨

[alexander-akait]

Good job! Please update changelog

[GavinJoyce]

[GavinJoyce]

Has CI stalled?

https://dev.azure.com/prettier/79013671-677c-4846-a6d8-3050d40e21c0/_build/results?buildId=1003 seems to indicate an error:

I'm going to risk going to the back of the CI queue with a rebase to trigger a new CI build

EDIT: a rebase seems to have worked

[GavinJoyce]

This is ready for review