feat(medusa-payment-paypal,medusa-payment-stripe): speed up unit tests in CI (#6806)

* chore: shard unit tests

* chore: move paypal and stripe to swc

* chore: update actions

* chore: refactor http paypal client

* chore: added changeset

* chore: remove medusa changes

scripts/run-workspace-unit-tests-in-chunks.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+
+# Get array of workspaces
+# convert NDJSON stream to an array of arrays, divided by chunk size
+# The reason we do a conditional here is that github actions thinks that there is
+# a secret present with the output of this and therefore refuses to share data between jobs
+if [ -z "${CHUNKS}" ]; then
+  export CHUNKS=$(yarn workspaces list --json | jq -j '[inputs | .name]' | jq -r | jq -cM '[_nwise(length / 2 | ceil)]')
+fi
+
+# get the workspaces of the current CHUNK environment
+workspaces=$(echo $CHUNKS | jq -r ".[$CHUNK]")
+
+echo "workspaces - $workspaces"
+# Initialize an empty string for the filters
+filters=""
+
+# Loop through each workspace in the array
+for workspace in $(echo "$workspaces" | jq -r '.[]'); do
+  # Add the workspace name to the filters array as an argument
+  filters+=" --filter=${workspace}"
+done
+
+# Run the test in the selected chunk
+yarn run test $filters