Fix URI for autoconfig test for specviz2d, add back specviz test

[bmorris3]

Description

Remote data tests are currently failing on a file lookup in MAST. This PR replaces that specific, unresolvable URI to one that works.

We had commented out a Specviz test, which I've added again, since #2576 was merged.

Change log entry

• Is a change log needed? If yes, is it added to CHANGES.rst? If you want to avoid merge conflicts,
  list the proposed change log here for review and add to CHANGES.rst before merge. If no, maintainer
  should add a no-changelog-entry-needed label.

Checklist for package maintainer(s)

This checklist is meant to remind the package maintainer(s) who will review this pull request of some common things to look for. This list is not exhaustive.

• Are two approvals required? Branch protection rule does not check for the second approval. If a second approval is not necessary, please apply the trivial label.
• Do the proposed changes actually accomplish desired goals? Also manually run the affected example notebooks, if necessary.
• Do the proposed changes follow the STScI Style Guides?
• Are tests added/updated as required? If so, do they follow the STScI Style Guides?
• Are docs added/updated as required? If so, do they follow the STScI Style Guides?
• Did the CI pass? If not, are the failures related?
• Is a milestone set? Set this to bugfix milestone if this is a bug fix and needs to be released ASAP; otherwise, set this to the next major release milestone. Bugfix milestone also needs an accompanying backport label.
• After merge, any internal documentations need updating (e.g., JIRA, Innerspace)?

[kecnry]

Works for me once ✅ 🤞 Thanks!

[rosteen]

Tests passed, thanks!

[lumberbot-app]

Something went wrong ... Please have a look at my logs.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.78%. Comparing base (b6bf280) to head (108070e).
Report is 12 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3267      +/-   ##
==========================================
+ Coverage   88.63%   88.78%   +0.15%     
==========================================
  Files         125      125              
  Lines       18781    18832      +51     
==========================================
+ Hits        16646    16720      +74     
+ Misses       2135     2112      -23     

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

[pllim]

The bot is refusing to work, so a manual backport will have to be done.

[pllim]

Weird... Maybe you can just try manually open a PR from this branch and see.

https://github.com/meeseeksmachine/jdaviz/tree/auto-backport-of-pr-3267-on-v4.0.x

[pllim]

@meeseeksdev backport to v4.0.x

[lumberbot-app]

Could not push to auto-backport-of-pr-3267-on-v4.0.x due to error, aborting.