fix: DEV-2510: add guard with error message for non incremental, non sequential datasets. (#1752)

[bmartel]

Timeseries data is required to be ordered by an incrementing sequence to work with the TimeSeries tag. This adds a check when mapping the timestamps to find an out of order or decrementing value in the series.

https://labelstud.io/tags/timeseries.html

[bmartel]

/help

Command	Description
/frontend [<args> ...]	Actions with frontend. Type /frontend help for an additional help.

[bmartel]

/frontend help

Command	Description
/frontend build	Get build frontend static for all repos
/frontend build lsf [sha]	Get build frontend static for heartexlabs/label-studio-frontend only
/frontend build dm [sha]	Get build frontend static for heartexlabs/dm2 only

[codecov]

Codecov Report

Merging #2487 (98d49aa) into develop (17b40da) will decrease coverage by 0.36%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #2487      +/-   ##
===========================================
- Coverage    77.80%   77.43%   -0.37%     
===========================================
  Files          137      141       +4     
  Lines         9951    10250     +299     
===========================================
+ Hits          7742     7937     +195     
- Misses        2209     2313     +104     

Impacted Files	Coverage Δ
label_studio/label_studio/users/mixins.py	75.00% <0.00%> (-12.50%)	⬇️
...bel_studio/label_studio/organizations/functions.py	66.66% <0.00%> (-10.26%)	⬇️
label_studio/label_studio/users/forms.py	87.09% <0.00%> (-2.38%)	⬇️
label_studio/label_studio/tasks/serializers.py	84.27% <0.00%> (-2.27%)	⬇️
label_studio/label_studio/tasks/models.py	87.85% <0.00%> (-2.20%)	⬇️
...abel_studio/label_studio/data_manager/functions.py	64.70% <0.00%> (-1.97%)	⬇️
label_studio/label_studio/core/label_config.py	71.54% <0.00%> (-1.85%)	⬇️
label_studio/label_studio/data_manager/managers.py	80.17% <0.00%> (-1.54%)	⬇️
.../label_studio/data_manager/actions/experimental.py	18.62% <0.00%> (-0.89%)	⬇️
label_studio/label_studio/core/redis.py	43.33% <0.00%> (-0.74%)	⬇️
... and 32 more

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