feat(nextcloud_test): Add local test target

[provokateurin]

Closes #1901

I can split this PR into multiple ones if desired.

Removing the maximum version check is done because major versions of apps don't necessarily indicate incompatible APIs. In fact, none of the existing APIs should ever have breaking changes except for cases when they are removed which also shouldn't happen.

I validated that the latest version of the server an all relevant apps work just fine with our current tests 🎉

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 29.75%. Comparing base (b246d89) to head (377246b).
Report is 9 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2323   +/-   ##
=======================================
  Coverage   29.74%   29.75%           
=======================================
  Files         293      293           
  Lines      117527   117540   +13     
=======================================
+ Hits        34959    34973   +14     
+ Misses      82568    82567    -1     

Flag	Coverage Δ		*Carryforward flag
cookie_store	100.00% <ø> (ø)		Carriedforward from bc4fbc2
dynamite	31.08% <ø> (ø)		Carriedforward from bc4fbc2
dynamite_end_to_end_test	60.96% <ø> (ø)		Carriedforward from bc4fbc2
dynamite_runtime	85.40% <ø> (ø)		Carriedforward from bc4fbc2
neon_dashboard	96.20% <ø> (ø)
neon_framework	45.85% <0.00%> (ø)
neon_http_client	93.28% <ø> (ø)
neon_notifications	100.00% <ø> (ø)
neon_talk	99.46% <ø> (+<0.01%)	⬆️
nextcloud	26.64% <100.00%> (-0.01%)	⬇️
sort_box	90.90% <ø> (ø)		Carriedforward from bc4fbc2

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

Files	Coverage Δ
...xtcloud/lib/src/api/cookbook/cookbook_helpers.dart	100.00% <ø> (ø)
...kages/nextcloud/lib/src/api/core/core_helpers.dart	100.00% <ø> (ø)
...kages/nextcloud/lib/src/api/news/news_helpers.dart	100.00% <ø> (ø)
...ges/nextcloud/lib/src/api/notes/notes_helpers.dart	100.00% <ø> (ø)
...s/nextcloud/lib/src/api/spreed/spreed_helpers.dart	80.95% <ø> (ø)
...s/nextcloud/lib/src/api/tables/tables_helpers.dart	100.00% <ø> (ø)
...ckages/nextcloud/lib/src/models/version_check.dart	64.70% <100.00%> (-0.30%)	⬇️
packages/neon_framework/lib/src/pages/home.dart	0.00% <0.00%> (ø)

[Leptopoda]

I really like the abstraction between the docker and local version :)
Nice work 👍