Run ConcurrentSafe tests multiple times in CI (#5759)

This test has a high possibility of detecting issues like #5757.
https:/open-telemetry/opentelemetry-go/actions/runs/10635489400/job/29485188862?pr=5759

We need to merge fixes of #5757, like #5758, first.

.github/workflows/ci.yml

@@ -81,6 +81,20 @@ jobs:
  - name: Run tests with race detector
  run: make test-race
 
+ test-concurrent-safe:
+ runs-on: ubuntu-latest
+ steps:
+ - name: Checkout Repo
+ uses: actions/checkout@v4
+ - name: Install Go
+ uses: actions/setup-go@v5
+ with:
+ go-version: ${{ env.DEFAULT_GO_VERSION }}
+ check-latest: true
+ cache-dependency-path: "**/go.sum"
+ - name: Run ConcurrentSafe tests multiple times with race detector
+ run: make test-concurrent-safe
+
  test-coverage:
  runs-on: ubuntu-latest
  steps:

Makefile

@@ -145,12 +145,14 @@ build-tests/%:
 
 # Tests
 
-TEST_TARGETS := test-default test-bench test-short test-verbose test-race
+TEST_TARGETS := test-default test-bench test-short test-verbose test-race test-concurrent-safe
 .PHONY: $(TEST_TARGETS) test
 test-default test-race: ARGS=-race
 test-bench: ARGS=-run=xxxxxMatchNothingxxxxx -test.benchtime=1ms -bench=.
 test-short: ARGS=-short
 test-verbose: ARGS=-v -race
+test-concurrent-safe: ARGS=-run=ConcurrentSafe -count=100 -race
+test-concurrent-safe: TIMEOUT=120
 $(TEST_TARGETS): test
 test: $(OTEL_GO_MOD_DIRS:%=test/%)
 test/%: DIR=$*