[Python Dist] Fix grpc_distribtests_python (v1.63.x backport) (#36363)

Backport of #36352 to v1.63.x.
---
`setuptools` made a decision to change the artifact name it builds (from
`grpcio-health-checking` to `grpcio_health_checking`) in their latest
release (pypa/setuptools#4300).
As a result, we need broaden our regex so that our tests can pickup the
correct files.

### Note
* Using `[_-]*` instead of `[_-]?` to match one character since `bash`
uses a different flavor of regular expressions called basic regular
expressions (BREs) which do not support the optional quantifier `?`.

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test/distrib/python/test_packages.sh

@@ -19,22 +19,25 @@ cd "$(dirname "$0")"
 
 shopt -s nullglob
 
+echo "Testing Python packages with input artifacts:"
+ls "$EXTERNAL_GIT_ROOT"/input_artifacts
+
 if [[ "$1" == "binary" ]]
 then
   echo "Testing Python binary distribution"
-  ARCHIVES=("$EXTERNAL_GIT_ROOT"/input_artifacts/grpcio-[0-9]*.whl)
-  TOOLS_ARCHIVES=("$EXTERNAL_GIT_ROOT"/input_artifacts/grpcio_tools-[0-9]*.whl)
-  OBSERVABILITY_ARCHIVES=("$EXTERNAL_GIT_ROOT"/input_artifacts/grpcio_observability-[0-9]*.whl)
+  ARCHIVES=("$EXTERNAL_GIT_ROOT"/input_artifacts/grpcio[-_0-9a-z.]*.whl)
+  TOOLS_ARCHIVES=("$EXTERNAL_GIT_ROOT"/input_artifacts/grpcio[_-]*tools[-_0-9a-z.]*.whl)
+  OBSERVABILITY_ARCHIVES=("$EXTERNAL_GIT_ROOT"/input_artifacts/grpcio[_-]*observability[-_0-9a-z.]*.whl)
 else
   echo "Testing Python source distribution"
-  ARCHIVES=("$EXTERNAL_GIT_ROOT"/input_artifacts/grpcio-[0-9]*.tar.gz)
-  TOOLS_ARCHIVES=("$EXTERNAL_GIT_ROOT"/input_artifacts/grpcio-tools-[0-9]*.tar.gz)
-  OBSERVABILITY_ARCHIVES=("$EXTERNAL_GIT_ROOT"/input_artifacts/grpcio-observability-[0-9]*.tar.gz)
+  ARCHIVES=("$EXTERNAL_GIT_ROOT"/input_artifacts/grpcio[-_0-9a-z.]*.tar.gz)
+  TOOLS_ARCHIVES=("$EXTERNAL_GIT_ROOT"/input_artifacts/grpcio[_-]*tools[-_0-9a-z.]*.tar.gz)
+  OBSERVABILITY_ARCHIVES=("$EXTERNAL_GIT_ROOT"/input_artifacts/grpcio[_-]*observability[-_0-9a-z.]*.tar.gz)
 fi
 
-HEALTH_ARCHIVES=("$EXTERNAL_GIT_ROOT"/input_artifacts/grpcio-health-checking-[0-9]*.tar.gz)
-REFLECTION_ARCHIVES=("$EXTERNAL_GIT_ROOT"/input_artifacts/grpcio-reflection-[0-9]*.tar.gz)
-TESTING_ARCHIVES=("$EXTERNAL_GIT_ROOT"/input_artifacts/grpcio-testing-[0-9]*.tar.gz)
+HEALTH_ARCHIVES=("$EXTERNAL_GIT_ROOT"/input_artifacts/grpcio[_-]*health[_-]*checking[-_0-9a-z.]*.tar.gz)
+REFLECTION_ARCHIVES=("$EXTERNAL_GIT_ROOT"/input_artifacts/grpcio[_-]*reflection[-_0-9a-z.]*.tar.gz)
+TESTING_ARCHIVES=("$EXTERNAL_GIT_ROOT"/input_artifacts/grpcio[_-]*testing[-_0-9a-z.]*.tar.gz)
 
 VIRTUAL_ENV=$(mktemp -d)
 python3 -m virtualenv "$VIRTUAL_ENV"