Update to minSdkVersion 19 for tests.

androidx.test.monitor and other related libraries
have updated their minSdkVersion to 19.
This causes any android_test* target with minSdkVersion
< 19 to fail building.

This commit increments the affected tests to minSdkVersion 19.

Test: m tests
Bug: 299123220
Change-Id: I5cc2c236fb474ac373c5cca4cc79abcd2e558d61
Merged-In: I5cc2c236fb474ac373c5cca4cc79abcd2e558d61
(cherry picked from commit d9545965)