[FSSDK-12169] package manager update

[junaed-optimizely]

Summary

This pull request updates the project's Node.js and dependency versions, standardizes on npm for scripts and CI, and improves ESLint and Husky configurations. The changes help modernize the codebase and streamline development workflows.

Test plan

Existing tests should pass

Issues

• FSSDK-12169

[github-actions]

Jest Coverage Report

St.❔	Category	Percentage	Covered / Total
🟢	Statements	98.95%	851/860
🟢	Branches	92.02% (+0.5% 🔼)	461/501
🟢	Functions	97.52%	157/161
🟢	Lines	99.1%	769/776

Show files with reduced coverage 🔻

St.❔	File	Statements	Branches	Functions	Lines
🟢	client.ts	99.28%	94.09% (-0.35% 🔻)	96.97%	99.5%
🟢	notifier.ts	100%	50% (-50% 🔻)	100%	100%
🟢	Experiment.tsx	96.55%	90% (-2.31% 🔻)	100%	96.15%

Test suite run success

266 tests passing in 10 suites.

Report generated by 🧪jest coverage report action from 85adec8