[backend] pass agent active threshold to 1h (#2234)

[guillaumejparis]

Proposed changes

Related issues

• Closes Need to improve our management of active/inactive endpoint status based on executors #2234

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality
• For bug fix -> I implemented a test that covers the bug

Further comments

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