chore(functions/helloworld): split samples into dirs

[ace-n]

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 24 region tags.

• functions/helloworld/helloError/index.js:30, tag functions_helloworld_error
• functions/helloworld/helloError/index.js:45, tag functions_helloworld_error
• functions/helloworld/helloError/index.js:62, tag functions_helloworld_error
• functions/helloworld/helloError/index.js:70, tag functions_helloworld_error
• functions/helloworld/helloGCS/index.js:17, tag functions_helloworld_storage
• functions/helloworld/helloGCS/test/sample.integration.storage.test.js:15, tag functions_storage_integration_test
• functions/helloworld/helloGCS/test/sample.integration.storage.test.js:25, tag functions_storage_integration_test
• functions/helloworld/helloGCS/test/sample.system.storage.test.js:15, tag functions_storage_system_test
• functions/helloworld/helloGCS/test/sample.system.storage.test.js:52, tag functions_storage_system_test
• functions/helloworld/helloGCS/test/sample.unit.storage.test.js:16, tag functions_storage_unit_test
• functions/helloworld/helloPubSub/index.js:19, tag functions_helloworld_pubsub
• functions/helloworld/helloPubSub/test/sample.integration.pubsub.test.js:15, tag functions_pubsub_integration_test
• functions/helloworld/helloPubSub/test/sample.integration.pubsub.test.js:25, tag functions_pubsub_integration_test
• functions/helloworld/helloPubSub/test/sample.integration.pubsub.test.js:138, tag functions_pubsub_integration_test
• functions/helloworld/helloPubSub/test/sample.system.pubsub.test.js:15, tag functions_pubsub_system_test
• functions/helloworld/helloPubSub/test/sample.system.pubsub.test.js:44, tag functions_pubsub_system_test
• functions/helloworld/helloPubSub/test/sample.unit.pubsub.test.js:16, tag functions_pubsub_unit_test
• functions/helloworld/helloworldGet/index.js:17, tag functions_helloworld_get
• functions/helloworld/helloworldHttp/index.js:17, tag functions_helloworld_http
• functions/helloworld/helloworldHttp/test/sample.integration.http.test.js:15, tag functions_http_integration_test
• functions/helloworld/helloworldHttp/test/sample.integration.http.test.js:24, tag functions_http_integration_test
• functions/helloworld/helloworldHttp/test/sample.system.http.test.js:15, tag functions_http_system_test
• functions/helloworld/helloworldHttp/test/sample.system.http.test.js:43, tag functions_http_system_test
• functions/helloworld/helloworldHttp/test/sample.unit.http.test.js:19, tag functions_http_unit_test

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