gh-117657: Add TSAN suppressions for the free-threaded build (#117736)

Additionally, reduce the iterations for a few weakref tests that would
otherwise take a prohibitively long amount of time (> 1 hour) when TSAN
is enabled and the GIL is disabled.

.github/workflows/build.yml

@@ -492,6 +492,7 @@ jobs:
     with:
       config_hash: ${{ needs.check_source.outputs.config_hash }}
       options: ./configure --config-cache --with-thread-sanitizer --with-pydebug
+      suppressions_path: Tools/tsan/supressions.txt
 
   build_tsan_free_threading:
     name: 'Thread sanitizer (free-threading)'
@@ -501,6 +502,7 @@ jobs:
     with:
       config_hash: ${{ needs.check_source.outputs.config_hash }}
       options: ./configure --config-cache --disable-gil --with-thread-sanitizer --with-pydebug
+      suppressions_path: Tools/tsan/suppressions_free_threading.txt
 
   # CIFuzz job based on https://google.github.io/oss-fuzz/getting-started/continuous-integration/
   cifuzz:

.github/workflows/reusable-tsan.yml

@@ -7,6 +7,10 @@ on:
       options:
         required: true
         type: string
+      suppressions_path:
+        description: 'A repo relative path to the suppressions file'
+        required: true
+        type: string
 
 jobs:
   build_tsan_reusable:
@@ -30,7 +34,7 @@ jobs:
         sudo sysctl -w vm.mmap_rnd_bits=28
     - name: TSAN Option Setup
       run: |
-        echo "TSAN_OPTIONS=suppressions=${GITHUB_WORKSPACE}/Tools/tsan/supressions.txt" >> $GITHUB_ENV
+        echo "TSAN_OPTIONS=suppressions=${GITHUB_WORKSPACE}/${{ inputs.suppressions_path }}" >> $GITHUB_ENV
         echo "CC=clang" >> $GITHUB_ENV
         echo "CXX=clang++" >> $GITHUB_ENV
     - name: Add ccache to PATH