ci: update contracts tests to split by file (#11797)

Contracts tests were being split by test name which meant that
Circle CI wouldn't be able to (eventually) be able to properly
split these files by timings. Updates the CI job to split by
file instead.

.circleci/config.yml

@@ -595,8 +595,16 @@ jobs:
       - run:
           name: run tests
           command: |
-            TESTS=$(forge test --list | grep -E '^\s{4}' | awk '{print $1}' | circleci tests split --split-by=timings | paste -sd "|" -)
-            forge test --match-test "$TESTS"
+            # Find all test files
+            TEST_FILES=$(find ./test -name "*.t.sol")
+            # Split the tests by timings
+            TEST_FILES=$(echo "$TEST_FILES" | circleci tests split --split-by=timings)
+            # Strip the leading "./test/" from each file path
+            TEST_FILES=$(echo "$TEST_FILES" | sed 's|./test/||')
+            # Generate the match path
+            MATCH_PATH="./test/{$(echo "$TEST_FILES" | paste -sd "," -)}"
+            # Run the tests
+            forge test --match-path "$MATCH_PATH"
           environment:
             FOUNDRY_PROFILE: ci
           working_directory: packages/contracts-bedrock