devcontainer: replace VAULT_HOST with AWS_ROLE_ARN

[jjacobelli]

Description

This PR is replacing the VAULT_HOST variable with AWS_ROLE_ARN. This is required to use the new token service to get AWS credentials

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[dagardner-nv]

/merge

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.99%. Comparing base (4f23470) to head (adad84e).
Report is 2 commits behind head on branch-24.10.

Additional details and impacted files

@@               Coverage Diff                @@
##           branch-24.10     #506      +/-   ##
================================================
+ Coverage         73.97%   73.99%   +0.02%     
================================================
  Files               403      403              
  Lines             14472    14472              
  Branches           1138     1139       +1     
================================================
+ Hits              10705    10708       +3     
+ Misses             3767     3764       -3     

Flag	Coverage Δ
cpp	70.54% <ø> (+0.02%)	⬆️
py	42.65% <ø> (ø)

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see 4 files with indirect coverage changes

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