Infrastructure: Switch off indexing on testsuite machines

[afabri]

Issue Details

@sloriot noticed that the indexing on the Apple desktops is resource hungry. As the testsuite machines are not used interactively this feature is not needed, and additionally it probably has to do some work when the next internal release gets installed.

We probably should just switch it off on the Windows testsuite machines, or at least exclude some directories from indexing.

https://learn.microsoft.com/en-us/troubleshoot/windows-client/shell-experience/windows-search-performance-issues

No idea if indexing exists also on Linux.

[afabri]

It may also be a non-issue on Windows, at least with the Classic settings