feat: remove deprecated api

[RebeccaStevens]

PR Checklist

• Addresses an existing open issue: fixes 🚀 Feature: Planning for a v3 major version #767
• That issue was marked as status: accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

Remove deprecated api

[codecov]

Codecov Report

❌ Patch coverage is 36.73469% with 31 lines in your changes missing coverage. Please review.
✅ Project coverage is 62.10%. Comparing base (7191948) to head (a69208d).
⚠️ Report is 1 commits behind head on v3.

Files with missing lines	Patch %	Lines
src/nodes/typeGuards/union.ts	0.00%	28 Missing ⚠️
src/types/utilities.ts	90.00%	2 Missing ⚠️
src/nodes/typeGuards/compound.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##               v3     #797      +/-   ##
==========================================
+ Coverage   61.16%   62.10%   +0.94%     
==========================================
  Files          35       34       -1     
  Lines        2987     2850     -137     
  Branches      468      462       -6     
==========================================
- Hits         1827     1770      -57     
+ Misses       1160     1080      -80     

Flag	Coverage Δ
5.5.4	62.10% <36.73%> (+0.94%)	⬆️
latest	62.10% <36.73%> (+0.94%)	⬆️

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