Conditionnaly wait for previous polling task

[vpaturet]

Summary

This is a follow-up PR for #6262 that improves the blocking wait logic: the polling thread is blocked only if the previous task takes longer than the polling interval.
In this case a log message indicates the additional waiting period.

The encapsulation of the task submission to the graph writer thread was missing in the SIRI-SX and SIRI-ET updater, this is fixed. As a result the callback saveResultOnGraph can be made private in PollingGraphUpdater.

Issue

No

Unit tests

TODO

Documentation

No

[codecov]

Codecov Report

Attention: Patch coverage is 25.00000% with 9 lines in your changes missing coverage. Please review.

Project coverage is 69.72%. Comparing base (5ab75af) to head (49b8134).

Files with missing lines	Patch %	Lines
...entripplanner/updater/spi/PollingGraphUpdater.java	30.00%	5 Missing and 2 partials ⚠️
...ripplanner/updater/siri/updater/SiriETUpdater.java	0.00%	1 Missing ⚠️
...ripplanner/updater/siri/updater/SiriSXUpdater.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@              Coverage Diff              @@
##             dev-2.x    #6401      +/-   ##
=============================================
- Coverage      69.73%   69.72%   -0.01%     
- Complexity     18023    18024       +1     
=============================================
  Files           2057     2057              
  Lines          76978    76985       +7     
  Branches        7845     7844       -1     
=============================================
  Hits           53678    53678              
- Misses         20550    20555       +5     
- Partials        2750     2752       +2     

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