Do not start telemetry_poller when no metric exports are configured #1958

Job	Run time
List packages	5s
List examples	6s
Build and test (packages/typescript-client)	1m 11s
Check packages/typescript-client	32s
Build and test (packages/experimental)	58s
Check packages/experimental	28s
Build and test (packages/react-hooks)	1m 2s
Check packages/react-hooks	35s
Check and build examples/encryption	42s
Check and build examples/proxy-auth	53s
Check and build examples/linearlite-read-only	49s
Check and build examples/tanstack	41s
Check and build examples/linearlite	48s
Check and build examples/gatekeeper-auth	27s
Check and build examples/write-patterns	42s
Check and build examples/yjs	56s
Check and build examples/remix	42s
Check and build examples/react	35s
Check and build examples/todo-app	35s
Check and build examples/bash	28s
Check and build examples/nextjs	59s
Check and build examples/redis	35s
	14m 49s

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