GOPACKAGEDRIVERS generates an "invalid use of internal package" false positive when testing an internal package.

### What version of rules_go are you using?

v0.42.0

### What version of gazelle are you using?

v0.34.0

### What version of Bazel are you using?

7.0.2

### Does this issue reproduce with the latest releases of all the above?

Yes

### What operating system and processor architecture are you using?

Fedora workstation 39 amd64

### Any other potentially useful information about your toolchain?

Clang LLVM 16

### What did you do?

Add a black-box test to an internal package.

Note: Only happens when GOPACKAGESDRIVER is used and the package name is "mypackage_test" if I change the package name to "mypackage" then the error disappears.

### What did you expect to see?

No errors in my imports.

### What did you see instead?

An "invalid use of internal package" error in my imports.

Start by reproducing the reported case with GOPACKAGESDRIVER: a black-box test in an internal package named mypackage_test, then compare it with mypackage. Trace the GOPACKAGESDRIVER handling of the internal-package import and verify the fix no longer reports an invalid-use error while preserving the expected import checks.

Written by the indexing model from the issue text.