fix(ci): convert dot-notation test paths to file paths for CircleCI rerun

CircleCI's 'Rerun failed tests' feature passes test identifiers from the
JUnit XML classname attribute (dot notation, e.g.
'tests.local_testing.test_router') via stdin. pytest receives these paths
and collects 0 items, causing the rerun to exit 123 with no tests run.

Add an awk preprocessor before xargs that detects dot-notation module
paths and converts them to file paths (tests/local_testing/test_router.py).
File paths already containing '.py' are passed through unchanged.

Applied to all three jobs using the 'circleci tests run' + 'xargs pytest'
pattern: local_testing_part1, local_testing_part2, and the router test job.

.circleci/config.yml

@@ -220,7 +220,7 @@ jobs:
             echo "$TEST_FILES" | circleci tests run \
               --split-by=timings \
               --verbose \
-              --command="xargs uv run --no-sync python -m pytest \
+              --command="awk '/\\.py/ {print; next} {gsub(/\\./, \"/\"); print \$0 \".py\"}' | xargs uv run --no-sync python -m pytest \
                 -vv \
                 --cov=litellm \
                 --cov-report=xml \
@@ -301,7 +301,7 @@ jobs:
             echo "$TEST_FILES" | circleci tests run \
               --split-by=timings \
               --verbose \
-              --command="xargs uv run --no-sync python -m pytest \
+              --command="awk '/\\.py/ {print; next} {gsub(/\\./, \"/\"); print \$0 \".py\"}' | xargs uv run --no-sync python -m pytest \
                 -vv \
                 --cov=litellm \
                 --cov-report=xml \
@@ -466,7 +466,7 @@ jobs:
             echo "$TEST_FILES" | circleci tests run \
               --split-by=timings \
               --verbose \
-              --command="xargs uv run --no-sync python -m pytest \
+              --command="awk '/\\.py/ {print; next} {gsub(/\\./, \"/\"); print \$0 \".py\"}' | xargs uv run --no-sync python -m pytest \
                 -v \
                 -k 'router' \
                 -n 4 \