Rename ApiExtensionsHostTestCase -> SdkExtensions...

For consistency with the rest of the module.

Bug: 149815613
Test: atest sdkextensions_e2e_tests
Change-Id: I5a80da23cc90e8f8dfcb7c3b205af475a1786e99
Merged-In: I5a80da23cc90e8f8dfcb7c3b205af475a1786e99
(cherry picked from commit 769deb19155350012971bb7e176f482e36353e82)
2 files changed