[python] PY-90738 don't report test as unavailable in Python 3.15

- `test` packages is available in some CPython builds
- it contains CPython own test suite
- some users shadow it by custom `test` module/package
- no reason to report it as missing in 3.15


(cherry picked from commit 045d2e01bb5f99747c89846821203d0f17d42415)

IJ-MR-211774

GitOrigin-RevId: a55a2142c659afa3810d40979d7b88819e6f94ee

python/helpers/tools/versions.xml

@@ -5702,7 +5702,6 @@
     <module>sunaudio</module>
     <module>symbol</module>
     <module>telnetlib</module>
-    <module>test</module>
     <module>thread</module>
     <module>tkColorChooser</module>
     <module>tkCommonDialog</module>