refactor(neon_framework): Cleanup version checks

[provokateurin]

Exposes all checks which will be necessary for apps to check what version is actually used.

[codecov]

Codecov Report

Attention: Patch coverage is 30.00000% with 14 lines in your changes are missing coverage. Please review.

Project coverage is 29.31%. Comparing base (09ddf6f) to head (f699c8f).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2027      +/-   ##
==========================================
+ Coverage   28.94%   29.31%   +0.37%     
==========================================
  Files         250      249       -1     
  Lines       84422    84425       +3     
==========================================
+ Hits        24432    24746     +314     
+ Misses      59990    59679     -311     

Flag	Coverage Δ		*Carryforward flag
dynamite	31.00% <ø> (ø)		Carriedforward from 09ddf6f
dynamite_end_to_end_test	61.47% <ø> (ø)		Carriedforward from 09ddf6f
dynamite_runtime	85.40% <ø> (ø)		Carriedforward from 09ddf6f
neon_dashboard	92.56% <ø> (ø)
neon_framework	38.32% <0.00%> (+0.03%)	⬆️
neon_talk	96.32% <ø> (ø)
nextcloud	26.12% <85.71%> (+0.43%)	⬆️
sort_box	90.90% <ø> (ø)		Carriedforward from 09ddf6f

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

Files	Coverage Δ
packages/nextcloud/lib/src/helpers/core.dart	100.00% <100.00%> (ø)
packages/nextcloud/lib/src/helpers/common.dart	87.50% <66.66%> (-12.50%)	⬇️
packages/neon_framework/lib/src/pages/home.dart	0.00% <0.00%> (ø)
...ework/lib/src/pages/login_check_server_status.dart	0.00% <0.00%> (ø)
packages/neon_framework/lib/src/blocs/apps.dart	0.00% <0.00%> (ø)

... and 7 files with indirect coverage changes