Added ability to disable query to ArtifactHub via env

[alessandrodetta]

It is now possible to disable the query through environment variable HD_NO_ARTIFACT_HUB_QUERY.

Changes Proposed

As suggested by @undera in #506

Check List

• The title of my pull request is a short description of the changes
• This PR relates to some issue: Closes trying to check artifacts on ArtifactHub #506
• I have documented the changes made (if applicable)
• I have covered the changes with unit tests

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 30.18%. Comparing base (b5bed10) to head (4b93040).

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #515   +/-   ##
=======================================
  Coverage   30.18%   30.18%           
=======================================
  Files          10       10           
  Lines        1335     1335           
=======================================
  Hits          403      403           
  Misses        891      891           
  Partials       41       41           

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[undera]

Very good.
Unfortunately, we have no documentation place to reflect this flag