Transfer files - Fix repo snapshot manager error

[talarian1]

• All tests passed. If this feature is not already covered by the tests, I added new tests.
• All static analysis checks passed.
• This pull request is on the dev branch.
• I used gofmt for formatting the code before submitting the pull request.

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This fix resolves an issue with the jf rt transfer-files command.
The symptom of this issue is the following error message that occasionally could be seen in the log:

repo snapshot manager - could not reach the representing node for path...
The key to fixing the issue is the change made to the findMatchingNode function. The issue was that the findMatchingNode function could not always return the node. This is because the node may not be in the snapshot cache. It may yet to be discovered, or maybe it was discovered, but the snapshot cache didn't get a chance to get persisted yet, because of a shutdown of the command.

With this fix, the findMatchingNode function always fetches the node, It returns it if it's cached, creates it, and adds it to the cache if it isn't cached.