Adjust the timing of VPN type/profile/algorithms metrics collection

This adjustment is a prerequisite for a subsequent change that
will reset VPN metrics data, ensuring that these metrics are
consistently captured at the correct point in the VPN lifecycle.
This helps to prevent stale or incorrect data from being used in
metrics reporting, especially after a metrics reset.

Bug: 306313287
Test: atest FrameworksVpnTests
Flag: android.net.platform.flags.collect_vpn_metrics
Change-Id: Iaee4415caf738f9c57b769ec4d533004cc88b39a