The `spring.integration.properties` can come with the `noAutoStartup`
property where we can specify a source polling channel adapter endpoint to
not start automatically.
Turns out the `SourcePollingChannelAdapterFactoryBean` propagates its
`autoStartup` property unconditionally which will skip the `noAutoStartup` value
because an `AbstractEndpoint.setAutoStartup()` sets an `autoStartupSetExplicitly` state
* Fix `SourcePollingChannelAdapterFactoryBean` to rely on a `Boolean` object state
and don't call target endpoint `setAutoStartup()` if it was not set
* Adjust `spring.integration.properties` in tests to use `noAutoStartup`
for some `SourcePollingChannelAdapterFactoryBean`
* Verify that property was applied in the `IntegrationFlowTests.testWithSupplierMessageSourceImpliedPoller()`
**Cherry-pick to `5.4.x` & `5.3.x`**
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