UX: Report GitLab weburl of freshly created projects in the result

[adswa]

This harmonizes the reporting of create-sibling-gitlab and the
create-sibling-ghlike-commands slightly more, and fixes #6016.

Here is how it looks with the change:

(handbook2) adina@muninn in ~/repos/datalad on git:ux-6016
$ datalad create-sibling-gitlab  -d . --site jugit --project datalad3 --layout flat --access ssh         
create_sibling_gitlab(ok): . (dataset) [sibling repository 'jugit' created at https://jugit.fz-juelich.de/adswa/datalad3]
configure-sibling(ok): . (sibling)
action summary:
  configure-sibling (ok: 1)
  create_sibling_gitlab (ok: 1)

which is closer to what I get when using create-sibling-github:

$ datalad create-sibling-github new-create-sibling-command-gh4                 
create_sibling_github(ok): [sibling repository 'github' created at https://github.com/adswa/new-create-sibling-command-gh4]
configure-sibling(ok): . (sibling)
action summary:
  configure-sibling (ok: 1)
  create_sibling_github (ok: 1)

[adswa]

mhh, something is wrong with the unit tests (they did not start). Pushing an empty commit to trigger them

[codecov]

Codecov Report

Merging #6017 (10102d7) into maint (d183fd7) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            maint    #6017      +/-   ##
==========================================
+ Coverage   90.28%   90.30%   +0.01%     
==========================================
  Files         315      315              
  Lines       42149    42269     +120     
==========================================
+ Hits        38056    38169     +113     
- Misses       4093     4100       +7     

Impacted Files	Coverage Δ
datalad/distributed/create_sibling_gitlab.py	75.00% <100.00%> (+0.16%)	⬆️
datalad/downloaders/tests/test_http.py	89.17% <0.00%> (-1.89%)	⬇️
datalad/interface/tests/test_base.py	98.48% <0.00%> (-0.66%)	⬇️
datalad/utils.py	85.04% <0.00%> (+0.09%)	⬆️
datalad/distributed/tests/test_ria_basics.py	97.86% <0.00%> (+0.30%)	⬆️
datalad/distributed/ora_remote.py	31.74% <0.00%> (+0.32%)	⬆️
datalad/interface/base.py	92.01% <0.00%> (+1.78%)	⬆️

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[mih]

LGTM, thx!