ALEPH-518 Fix Confidential and GPU instance stopping after start

[olethanh]

Analysis
The update_allocations endpoint called by the scheduler stopped the instances as it wasn’t in the scheduler list

Solution
Better check which executions are started via the scheduler

Related ClickUp, GitHub or Jira tickets : ALEPH-518

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 64.56%. Comparing base (f599fbe) to head (753f681).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/aleph/vm/orchestrator/views/__init__.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #798   +/-   ##
=======================================
  Coverage   64.56%   64.56%           
=======================================
  Files          78       78           
  Lines        7092     7092           
  Branches      598      598           
=======================================
  Hits         4579     4579           
  Misses       2313     2313           
  Partials      200      200           

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