Refactor CTS JVMTI OWNERS for better maintenance

Make OWNERS in subdirectories empty as it inherits OWNERS defined in
parent directory by default. Each module's directory is still required to have OWNERS because we want to make sure each CTS module has clear ownership. Otherwise, if module-level OWNERS is missing, we can't know if ownership inherits from parent or developers forget to add it.

Bug: 126563878
Test: Ignored
Change-Id: I19d2ccae9c010d46594051af1b7db14cceb2f96e
172 files changed