feat: LEAP-1603: Use custom_task_lock_ttl in set_lock

[triklozoid]

• if FF is on and custom ttl set for current project - use it in set_lock function

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[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Please upload report for BASE (develop@66e17e5). Learn more about missing BASE report.
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
label_studio/tasks/models.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             develop    #6610   +/-   ##
==========================================
  Coverage           ?   76.63%           
==========================================
  Files              ?      169           
  Lines              ?    13838           
  Branches           ?        0           
==========================================
  Hits               ?    10605           
  Misses             ?     3233           
  Partials           ?        0           

Flag	Coverage Δ
pytests	76.63% <50.00%> (?)

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[triklozoid]

/git merge develop

Workflow run
Successfully merged: 1 file changed, 9 insertions(+), 6 deletions(-)