feat: isStrictCompilerOptionEnabled should default to strict: true for TS 6

[kirkwaiblinger]

PR Checklist

• Addresses an existing open issue: fixes 🚀 Feature: TypeScript 6 support #870
• That issue was marked as status: accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

Changes the way the options are resolved to make sure the strict options are enabled by default.

For the test infra, I've added typescript@rc into the test matrix in order to test TS 6. Once TS 6 is actually released, latest will cover TS 6 and we can pin TS@5.9.3 to test the latest TS 5 version.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.89%. Comparing base (c745c68) to head (6284ddb).
⚠️ Report is 63 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #873      +/-   ##
==========================================
+ Coverage   61.86%   61.89%   +0.03%     
==========================================
  Files          35       35              
  Lines        2989     2992       +3     
  Branches      473      475       +2     
==========================================
+ Hits         1849     1852       +3     
  Misses       1140     1140              

Flag	Coverage Δ
4.8.4	60.52% <100.00%> (+0.03%)	⬆️
latest	61.16% <100.00%> (+0.03%)	⬆️
rc	61.16% <100.00%> (?)

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