[MINOR][CORE][TESTS] Move TransportConfSuite.java to correct directory

### What changes were proposed in this pull request?
The `TransportConfSuite.java` was mistakenly placed in the `common/network-common/src/test/java/` directory, this pr move it to correct directory

### Why are the changes needed?
Move `TransportConfSuite.java` to correct directory

### Does this PR introduce _any_ user-facing change?
No

### How was this patch tested?
Pass GitHub Actions

### Was this patch authored or co-authored using generative AI tooling?
No

Closes #43977 from LuciferYang/minor-TransportConfSuite-dir.

Authored-by: yangjie01 <[email protected]>
Signed-off-by: Dongjoon Hyun <[email protected]>

Author: LuciferYang