Utilize external resource setup notebook for code management

[edan-bainglass]

This PR provides a top level button and a link in step 3 to the new external resource setup notebook in aiidalab-home (aiidalab/aiidalab-home#188). It also removes the code setup widget buttons from the individual code selectors in step 3 (in favor of the external notebook).

[codecov]

Codecov Report

Attention: Patch coverage is 62.50000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 67.99%. Comparing base (416fb6f) to head (e563af8).

Files with missing lines	Patch %	Lines
src/aiidalab_qe/common/panel.py	50.00%	4 Missing ⚠️
src/aiidalab_qe/app/submission/__init__.py	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #986      +/-   ##
==========================================
- Coverage   67.99%   67.99%   -0.01%     
==========================================
  Files         113      113              
  Lines        6734     6740       +6     
==========================================
+ Hits         4579     4583       +4     
- Misses       2155     2157       +2     

Flag	Coverage Δ
python-3.11	67.99% <62.50%> (-0.01%)	⬇️
python-3.9	68.01% <62.50%> (-0.01%)	⬇️

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[edan-bainglass]

Hi @superstar54. If you're interested, take a look at the last commit. I moved some stuff around to better fit our overall MVC approach.

[edan-bainglass]

@yakutovicha can you say more regarding reasons for previously moving from external code setup to in-line widgets?

[edan-bainglass]

@yakutovicha no response 😔 If okay with you, can we proceed with this PR? We can revisit in-app code setup widgets later, perhaps when the widget is in a better, lazy-loaded state. Note that we (Giovanni, Carlo, and I) have been discussion revamping the widget entirely. Let's see.

[edan-bainglass]

@superstar54 can we approve this one?

[superstar54]

LGTM!

It's very alloying that there are failed tests. We should address this somehow in the future.

[edan-bainglass]

LGTM!

It's very alloying that there are failed tests. We should address this somehow in the future.

#1079