feat(get-modflow): retry transient network failures

[wpbonelli]

Use a consistent retry mechanism for all three network calls

• list releases
• get info for a single release
• download a release archive

with a configurable exponential backoff. Previously the download didn't retry, just the first two queries

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 36.0%. Comparing base (556c088) to head (8dd3f5a).
⚠️ Report is 231 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #2849      +/-   ##
==========================================
- Coverage     55.5%   36.0%   -19.6%     
==========================================
  Files          644     345     -299     
  Lines       124135   66590   -57545     
==========================================
- Hits         68947   23992   -44955     
+ Misses       55188   42598   -12590     

see 570 files with indirect coverage changes

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