Address PR comments for the new Encode task

[priettt]

• Rename encode task to make it more generic
• Use Base64.wrap

[fractalwrench]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.35%. Comparing base (27e9fe9) to head (d067935).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2093   +/-   ##
=======================================
  Coverage   85.35%   85.35%           
=======================================
  Files         470      470           
  Lines       10578    10578           
  Branches     1564     1564           
=======================================
  Hits         9029     9029           
  Misses        869      869           
  Partials      680      680           

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[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

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