[build-tools] Add npm cache fallback to install_node_modules step

[AbbanMustafa]

Why

The npm cache install fallback only covered the managed prebuild install (prebuildAsync). Workflow and generic jobs install dependencies through the eas/install_node_modules step, which called installDependenciesAsync directly and had no fallback.

How

• Routed eas/install_node_modules through installDependenciesWithNpmCacheFallbackAsync instead of installDependenciesAsync, so the step applies the cache registry per-spawn and, on a cache-registry failure, retries once against the default registry.

Test Plan

• New installNodeModules.test.ts verifies the step installs through the cache registry on the first attempt and retries without it (dropping NPM_CONFIG_REGISTRY) when the cache install fails, and does not retry when the npm cache is not enabled.

[github-actions]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 59.21%. Comparing base (52e6fd0) to head (0f2823f).

Additional details and impacted files

@@                      Coverage Diff                       @@
##           npm-cache-registry-scoping    #3924      +/-   ##
==============================================================
+ Coverage                       59.17%   59.21%   +0.04%     
==============================================================
  Files                             935      935              
  Lines                           41070    41069       -1     
  Branches                         8646     8646              
==============================================================
+ Hits                            24300    24315      +15     
+ Misses                          16675    16659      -16     
  Partials                           95       95              

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[github-actions]

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