odb: give PtrSetMap one Bazel owner

[naveenvenk17]

PtrSetMap.h is exported by both //src/odb/src/db and //src/odb/src/gdsin. GDS input already depends on the db target, so its second export leaves Bazel with two owners for the same public header.

Keep the header owned by OpenDB core and let GDS input receive it through that dependency. This removes the remaining PtrSetMap.h duplicate reported by Bant and covers one item from #10409.

Testing on the GCP VM:

• bazel test //src/odb/test:cpp_tests, all 23 C++ tests pass
• bazel build --config=lint //src/odb/src/gdsin
• bazel test --config=asan //src/odb/test/cpp:TestGDSIn --test_env=ASAN_OPTIONS=detect_leaks=0 with bazel: fix hermetic ASan builds #10911 layered locally
• bant target-hdrs -e -d //src/odb/... no longer reports PtrSetMap.h

[gemini-code-assist]

Code Review

This pull request removes the unused header dependency //src/odb:include/odb/PtrSetMap.h from the gdsin library target in the Bazel BUILD file. I have no feedback to provide as there are no review comments.