handlebars: Print final blockParam on its own line

[dcyriller]

Description

This PR implements the change proposed in #8502.

Given these options:

--parser glimmer
--print-width 40

Input:

<MyComponent @prop={{true}} @prop2={{true}} as |thing|></MyComponent>

Current Output:

<MyComponent
  @prop={{true}}
  @prop2={{true}} as |thing|
/>

Proposal:

<MyComponent
  @prop={{true}}
  @prop2={{true}}
  as |thing|
/>

cc @pzuraq

Checklist

• 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 changelog_unreleased/*/XXXX.md file following changelog_unreleased/TEMPLATE.md.
• I’ve read the contributing guidelines.

✨Try the playground for this PR✨

[fisker]

Looks good 👍

[fisker]

@dcyriller Can you fix the conflicts?

[dcyriller]

done ✅
To me, the other PR brought a nice simplificaction.