Poll interval from capabilities (#8777)

* Add remotePollInterval capability.

* Use public const int rather than define for default value.

* Honour pollinterval from account capabilities for poll frequency.

With this, admins can change the remote poll interval of desktop
clients with the capability settings.

* Use more efficient invocation of the etag job slot.

* Consider capability value to be in milliseconds.

* Make format check happy.

* Add a ElapsedTimer to measure time since last Etag check.

Also, do the check if one of the folders is due to sync every
second. That way we get a more accurate sync frequency. The
check is very lightweight.

* Extend remotePollInterval config method to accept default value.

With that it is possible to read the value for the remotepollinterval
from the capabilities.

* Add changelog entry for #8777.

* Changes from clang-format

* Fix changelog entry, punctuation at end.

* do not go for assumptions how long the request takes. No magic number.

* Change some method interfaces to seconds rather than microseconds.

Feedback from review.

* Again considering more review feedback

* Remove additional 5s check already performed in ConfigFile::remotePollInterval

Co-authored-by: Hannah von Reth <hannah.vonreth@owncloud.com>

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