Consistent params in FlowClient

[greenape]

Closes #470

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

Changes the stop_date parameters of modal_location_from_dates and meaningful_locations_* functions to end_date in line with the other functions.

[codecov]

Codecov Report

Merging #648 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #648   +/-   ##
=======================================
  Coverage   93.52%   93.52%           
=======================================
  Files         124      124           
  Lines        6235     6235           
  Branches      660      660           
=======================================
  Hits         5831     5831           
  Misses        280      280           
  Partials      124      124

Impacted Files	Coverage Δ
flowclient/flowclient/client.py	94.08% <ø> (ø)	⬆️
.../core/server/query_schemas/meaningful_locations.py	100% <100%> (ø)	⬆️

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