fix: resume branch end node shared, insert after previous branch

[rturnq]

Description

• Resume markers used as branch end nodes could end up being shared between multiple branches in some circumstances. In these cases, we will inserts a new empty text node and use that as the end node.
• Runtime now uses the end node as a reference for inserting the branch. The new branch will be inserted after the previous branch's end node instead of before its start node.

Checklist:

• I have read the CONTRIBUTING document and have signed (or will sign) the CLA.
• I have updated/added documentation affected by my changes.
• I have added tests to cover my changes.

[changeset-bot]

🦋 Changeset detected

Latest commit: 5a36940

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@marko/runtime-tags	Patch

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.02%. Comparing base (99c7428) to head (98d0e91).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2483      +/-   ##
==========================================
- Coverage   87.09%   87.02%   -0.07%     
==========================================
  Files         351      351              
  Lines       40058    40063       +5     
  Branches     2588     2585       -3     
==========================================
- Hits        34887    34866      -21     
- Misses       5147     5173      +26     
  Partials       24       24              

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