refactor: use StringLiteralLike over StringLiteral | SubstitutionTemplateLiteral

[RebeccaStevens]

PR Checklist

• Addresses an existing open issue: fixes Maintenance issue #136
• That issue was marked as status: accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

A small refactor.

[codecov]

Codecov Report

Merging #128 (8b399b0) into main (65ab657) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #128   +/-   ##
=======================================
  Coverage   21.80%   21.80%           
=======================================
  Files          18       18           
  Lines         431      431           
  Branches      171      171           
=======================================
  Hits           94       94           
  Misses        315      315           
  Partials       22       22           

Flag	Coverage Δ
4.2.4	21.11% <ø> (ø)
4.3.5	21.34% <ø> (ø)
4.4.4	21.34% <ø> (ø)
latest	21.34% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/nodes/typeGuards/compound.ts	40.90% <ø> (ø)

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