Ensure proper resolution in case of errors for AWS-related variables

[pgrzesik]

Fixes a regression introduced with more granular error codes from AWS calls

Closes: #9516

[codecov]

Codecov Report

Merging #9518 (3310249) into master (2984adb) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #9518   +/-   ##
=======================================
  Coverage   86.75%   86.75%           
=======================================
  Files         322      322           
  Lines       12103    12103           
=======================================
  Hits        10500    10500           
  Misses       1603     1603           

Impacted Files	Coverage Δ
...ion/variables/sources/instance-dependent/get-cf.js	95.65% <100.00%> (ø)
...ion/variables/sources/instance-dependent/get-s3.js	100.00% <100.00%> (ø)
...on/variables/sources/instance-dependent/get-ssm.js	93.47% <100.00%> (ø)

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