Update EMBER-DANDI Sandbox API URL

[NEStock]

Previously was https://api-dandi-sandbox.emberarchive.org/
Now is https://api-dandi.sandbox.emberarchive.org/

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.07%. Comparing base (6f28a1c) to head (6477182).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1774      +/-   ##
==========================================
- Coverage   75.08%   75.07%   -0.01%     
==========================================
  Files          84       84              
  Lines       11910    11910              
==========================================
- Hits         8943     8942       -1     
- Misses       2967     2968       +1     

Flag	Coverage Δ
unittests	75.07% <ø> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[yarikoptic]

we would need to look what's up with the effects on tests

FAILED dandi/tests/test_dandiarchive.py::test_parse_api_url[EMBER-DANDI-SANDBOX:000029/draft-parsed_url14] - AssertionError: assert DandisetURL(i...on_id='draft') == DandisetURL(i...on_id='draft')
  
  Omitting 2 identical items, use -vv to show
  Differing attributes:
  ['instance']
  
  Drill down into differing attribute instance:
    instance: DandiInstance(name='ember-dandi-sandbox', gui='https://apl-setup--ember-dandi-archive.netlify.app', api='https://api-dandi.sandbox.emberarchive.org/api') != DandiInstance(name='ember-dandi-sandbox', gui='https://apl-setup--ember-dandi-archive.netlify.app/', api='https://api-dandi.sandbox.emberarchive.org/api')
    
    Omitting 2 identical items, use -vv to show
    Differing attributes:
    ['gui']
    
    Drill down into differing attribute gui:
      gui: 'https://apl-setup--ember-dandi-archive.netlify.app' != 'https://apl-setup--ember-dandi-archive.netlify.app/'
      - https://apl-setup--ember-dandi-archive.netlify.app/
      ?                                                   -
      + https://apl-setup--ember-dandi-archive.netlify.app
= 1 failed, 903 passed, 1 skipped, 6 deselected, 3 xfailed, 2 xpassed in 680.99s (0:11:20) =

seems like just a trailing / difference, unclear how change of depth in domain name effects that here....

[NEStock]

we would need to look what's up with the effects on tests
@yarikoptic interesting! I wonder if it makes sense to just drop the trailing slash on https://apl-setup--ember-dandi-archive.netlify.app/ ? it looks like it's the only gui value that has a trailing slash

[NEStock]

@yarikoptic I believe the test was fixed by removing the trailing slash. let me know if anything else is required to get this merged. thanks!