Fixes for reference data pipeline

[epassaro]

Motivation

Description

• Use already existing ci-helpers/fetch_reference_data.sh script to save LFS bandwith.
• Small changes to ci-helpers/fetch_reference_data.sh script.
• Add bash exit step on failure.
• Add a variable to choose between mamba and conda package managers.

How Has This Been Tested?

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have assigned/requested two reviewers for this pull request.

[codecov]

Codecov Report

Merging #1242 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1242   +/-   ##
=======================================
  Coverage   80.63%   80.63%           
=======================================
  Files          41       41           
  Lines        3424     3424           
=======================================
  Hits         2761     2761           
  Misses        663      663           

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