uncomment and use get_asn

[braingram]

Fixes #1318

This PR uncomments get_asn and uses it in the 2 regtests I found that pull associations from artifactory.

This allows the regtests to be simplified by not requiring them to:

• download files in an association in addition to the association
• get_asn automatically sets the rtdata.input attribute so the test does not need to set this

Regression tests running:
https://github.com/spacetelescope/RegressionTests/actions/runs/10267768330

Checklist

• added entry in CHANGES.rst under the corresponding subsection
• updated relevant tests
• updated relevant documentation
• updated relevant milestone(s)
• added relevant label(s)
• ran regression tests, post a link to the Jenkins job below. How to run regression tests on a PR

[codecov]

Codecov Report

Attention: Patch coverage is 12.50000% with 14 lines in your changes missing coverage. Please review.

Project coverage is 78.56%. Comparing base (ee8288f) to head (c9ba2ff).
Report is 191 commits behind head on main.

Files with missing lines	Patch %	Lines
romancal/regtest/regtestdata.py	12.50%	14 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1320      +/-   ##
==========================================
- Coverage   78.69%   78.56%   -0.14%     
==========================================
  Files         117      117              
  Lines        7844     7860      +16     
==========================================
+ Hits         6173     6175       +2     
- Misses       1671     1685      +14     

Flag	Coverage Δ		*Carryforward flag
nightly	62.26% <ø> (ø)		Carriedforward from ee8288f

*This pull request uses carry forward flags. Click here to find out more.

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[braingram]

@ddavis-stsci I requested your review since using get_asn would simplify the regression test you're adding in #1222

[mairanteodoro]

Looks good to me, @braingram! Thanks!

[braingram]

@mairanteodoro Thanks for taking a look. I'm seeing this PR as not approved. Is that intentional? If so, is there an issue to address or another person to approve it. Thanks again.

[mairanteodoro]

@mairanteodoro Thanks for taking a look. I'm seeing this PR as not approved. Is that intentional? If so, is there an issue to address or another person to approve it. Thanks again.

I was just deferring the approval to @ddavis-stsci. I will aprove it now.

[mairanteodoro]

Thanks, @braingram!

[braingram]

Thanks!

@ddavis-stsci Does this look good to you? It will be useful for #1348

I'm happy to either wait until after #1348 is merged and then update this PR or merge this PR so you can update #1348

[ddavis-stsci]

LGTM

[mairanteodoro]

Looks good to me.

[braingram]

Thanks! I'm re-running the regtests now (same link as above).

EDIT: this needs a new run (and new link) due to the patch table environment variable changes
Run here: https://github.com/spacetelescope/RegressionTests/actions/runs/10267768330

[braingram]

Regtests all passed.