[CtsStatsdHostTestCases] Updated MetadataTests

- added tracking SocketLoss atom counter as an
 indicator of successful atom storm simulation

Flag: EXEMPT bugfix

Bug: 323424122
Test: atest android.cts.statsd.metadata.MetadataTests
(cherry picked from https://android-review.googlesource.com/q/commit:2465353b061d90c738b9d31ad716ff00d78c70e8)
Merged-In: If55fdfade8b10bfaab9369ad95c12b865592b391
Change-Id: If55fdfade8b10bfaab9369ad95c12b865592b391
1 file changed