Ensure performance timings are sent as integer values

[MichaelRoosz]

I am currently testing Matomo 4.2.1.

The new Performance Report feature is not working at all:

• in matomo_log_link_visit_action the only field with non-NULL data is time_network and its always 0
• the other fields are always NULL
• -> Reports are empty

This is what the browsers are sending:

chrome
pf_net: 0
pf_srv: 1.150000000052387
pf_tfr: 1.2499999993451638

firefox
pf_net: 0
pf_srv: 2
pf_tfr: 1

• floats in chrome seem strange as the backend seems to expect integers
• the values 0/1/2 look like seconds but I guess we want milliseconds?

-> the performance feature seems completely broken at this time

[sgiehl]

@MichaelRoosz thanks for creating the issue. Actually both values should be in milliseconds.
I'll prepare a PR to round the values, so we use integer in all cases.
Not sure if the float values might cause problems when storing them in database..

[diosmosis]

Might be related to #17259

[sgiehl]

There had been some fixed aroud the Performance Timing tracking. I assume this one should have been fixed as well.
@MichaelRoosz If you still have an issue with this, please let us know, so we can reopen the issue. Thanks.