fix(glimmer): {{else}}{{#if}} into {{else if}} merging

[dcyriller]

Description

The first commit highlights the issue. The second fixes it.

The following code should be left untouched:

{{#if a}}
  a
{{else}}
  {{#if c}}
    c
  {{/if}}
  e
{{/if}}

Instead, it was turned into:

{{#if a}}
  a
{{else if c}}
  c
e
{{/if}}

Checks

• I’ve added tests to confirm my change works.
• (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.

Playground

✨Try the playground for this PR✨

[Turbo87]

awesome!! 👍

[alexander-akait]

Thanks!

Need add note in changelog

[dcyriller]

@evilebottnawi done, sorry for that

[dcyriller]

@evilebottnawi CHANGELOG.unreleased.md is up to date.

[alexander-akait]

@dcyriller Thanks, can you fix CI?

[dcyriller]

@evilebottnawi CI is now 🍏

I see that you squash the commits, so I don't bother to remove the last one (that was empty).

[alexander-akait]

/cc @prettier/core we need rule about merging (minimum 2 approve from core as example)