Fix Shell command injection in create-snap

[GuillaumeRx]

This changes execSync to spawnSync so we directly invoque the command and pass individual arguments to it.

2023-09-26.16-09-33.mp4

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (8c93bc2) 95.88% compared to head (61b3eda) 95.88%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1784   +/-   ##
=======================================
  Coverage   95.88%   95.88%           
=======================================
  Files         239      239           
  Lines        5465     5465           
  Branches      850      850           
=======================================
  Hits         5240     5240           
  Misses        225      225           

Files	Coverage Δ
packages/create-snap/src/cli.ts	100.00% <100.00%> (ø)
packages/create-snap/src/cmds/init/initUtils.ts	100.00% <100.00%> (ø)

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