fix some telemetry related warnings, and standardize on test helpers · absinthe-graphql/absinthe@228fa2e

Run unit tests: test/absinthe/integration/execution/telemetry_test.exs#L47

test Execute expected telemetry events (Absinthe.Integration.Execution.TelemetryTest)

Run unit tests: test/absinthe/middleware/async_test.exs#L86

test can resolve a field using the normal test helper and emit telemetry event (Absinthe.Middleware.AsyncTest)

Run unit tests: test/absinthe/middleware/batch_test.exs#L97

test can resolve batched fields cross-query that have different data requirements and should emit telemetry events (Absinthe.Middleware.BatchTest)

Run unit tests: test/absinthe/schema/notation/experimental/import_sdl_test.exs#L603

test telemetry executes on SDL defined schemas (Absinthe.Schema.Notation.Experimental.ImportSdlTest)

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The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2, actions/cache@v2. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

Run unit tests: test/absinthe/schema/notation/experimental/import_sdl_test.exs#L592