* GH-8745: Add RFT.shouldMarkSessionAsDirty()
Fixes https://github.com/spring-projects/spring-integration/issues/8745
Not all errors caught in the `RemoteFileTemplate.execute()`
are fatal to mark session as dirty and physically close the target session
in the cache
* Introduce a `RemoteFileTemplate.shouldMarkSessionAsDirty()`
to consult with an exception if it is really a fatal error to close
the session in the end.
* Override `shouldMarkSessionAsDirty()` in the `RemoteFileTemplate`
implementations to check statuses of respective protocol errors
**Cherry-pick to `6.1.x` & `6.0.x`**
* * Fix tests for pool interaction
* * Fix language in Javadocs
* Add more `not dirty` statuses to `SftpRemoteFileTemplate` & `SmbRemoteFileTemplate`
7d73e52b43