Client - change in behaviour - sporadic re-reading of prefs_override file

[RichardHaselgrove]

Describe the bug
While studying the Event Log with more care than usual for #5254 today, I've noticed a number of events like

Sun 28 May 2023 14:36:58 BST | Einstein@Home | Not requesting tasks: don't need (CPU: ; NVIDIA GPU: not highest priority project)
Sun 28 May 2023 14:36:59 BST | Einstein@Home | Scheduler request completed
Sun 28 May 2023 14:36:59 BST | Einstein@Home | Project requested delay of 60 seconds
Sun 28 May 2023 14:36:59 BST | World Community Grid | General prefs: from World Community Grid (last modified 15-Sep-2022 12:57:41)
Sun 28 May 2023 14:36:59 BST | World Community Grid | Computer location: work
Sun 28 May 2023 14:36:59 BST |  | General prefs: using separate prefs for work
Sun 28 May 2023 14:36:59 BST |  | Reading preferences override file
Sun 28 May 2023 14:36:59 BST |  | Preferences:
...

even when I've been away from the machine, and no instructions have been given to change or re-read any preferences. Originally, I thought it was connected with requesting new work, but as this example shows, it happens even when 'Not requesting tasks'.

It does happen, though, after every RPC to the Einstein project, but not after RPCs to other projects. It also happens on Windows machines running BOINC v7.22.1

Steps To Reproduce

1. Scroll back through the Event Log of machines running v7.22/23 and attached to Einstein

Expected behavior
As with v7.20.5 and before, only read the prefs_override file when specifically triggered by a request or change.

System Information

• OS: Linux and Windows, possibly others as well.
• BOINC Version: 7.22.1 and above.

Additional context
I suspect this may be caused by some debug code added during the development of #4871, but not disabled before release.

[AenBleidd]

@davidpanderson, could you please take a look?