sea: avoid dangling CLI option pointers

[Archkon]

Reserve exec argv storage before inserting configured and CLI-expanded arguments so vector reallocation cannot invalidate pointers in argv.

[nodejs-github-bot]

Review requested:

• @nodejs/single-executable

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.15%. Comparing base (4a5eb1c) to head (b043f5e).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #64755   +/-   ##
=======================================
  Coverage   90.15%   90.15%           
=======================================
  Files         744      744           
  Lines      242517   242517           
  Branches    45688    45693    +5     
=======================================
+ Hits       218642   218648    +6     
- Misses      15358    15360    +2     
+ Partials     8517     8509    -8     

Files with missing lines	Coverage Δ
src/node_sea.cc	89.53% <100.00%> (ø)

... and 23 files with indirect coverage changes

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