Look for COUNT instead of just first row in data_present_sensor

[Thingus]

Closes #5090

I have:

• Formatted any Python files with black
• Brought the branch up to date with master
• Added any relevant Github labels
• Added tests for any new additions
• Added or updated any relevant documentation
• Added an Architectural Decision Record (ADR), if appropriate
• Added an MPLv2 License Header if appropriate
• Updated the Changelog

Description

Instead of SELECT ing the first row in staging_table in data_present_sensor, this PR uses COUNT to check for data presence. This would still fail if no records are present (COUNT (*) would return 0 in the first cell), but would work if there's any data present in the first 100 records (arbitarily selected)

[cypress]

Passing run #18417 ↗︎

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Details:

Changelog
Project: FlowAuth	Commit: 9f72d53059
Status: Passed	Duration: 00:47 💡
Started: Feb 20, 2023 9:57 AM	Ended: Feb 20, 2023 9:58 AM

_{This comment has been generated by cypress-bot as a result of this project's GitHub integration settings.}

[jc-harrison]

Would be more efficient to do "select exists (select * from {{staging_table}} limit 1)"

[greenape]

Approved - add a changelog before sticking ready to merge label on

[codecov]

Codecov Report

Merging #5897 (9f72d53) into master (1bdc258) will decrease coverage by 14.85%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #5897       +/-   ##
===========================================
- Coverage   93.23%   78.39%   -14.85%     
===========================================
  Files         277      277               
  Lines       10828    10828               
  Branches      895      895               
===========================================
- Hits        10096     8489     -1607     
- Misses        602     2095     +1493     
- Partials      130      244      +114     

Impacted Files	Coverage Δ
...etl/flowetl/flowetl/sensors/data_present_sensor.py	100.00% <ø> (ø)
...e/flowmachine/core/sqlalchemy_table_definitions.py	0.00% <0.00%> (-100.00%)	⬇️
...wmachine/features/subscriber/active_subscribers.py	0.00% <0.00%> (-100.00%)	⬇️
...ne/features/subscriber/per_subscriber_aggregate.py	0.00% <0.00%> (-100.00%)	⬇️
...e/features/utilities/unique_values_from_queries.py	0.00% <0.00%> (-100.00%)	⬇️
...owmachine/features/utilities/feature_collection.py	23.80% <0.00%> (-76.20%)	⬇️
flowmachine/flowmachine/core/geotable.py	28.57% <0.00%> (-71.43%)	⬇️
...flowmachine/features/subscriber/distance_series.py	30.00% <0.00%> (-70.00%)	⬇️
...e/flowmachine/features/subscriber/handset_stats.py	21.95% <0.00%> (-68.30%)	⬇️
...es/subscriber/contact_reference_locations_stats.py	33.33% <0.00%> (-66.67%)	⬇️
... and 103 more

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