chore: fixes restart without indy pool disconnect

[GHkrishna]

What

Fixes: Unable to reinitialize agent once shut down #2135

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[sairanjit]

@GHkrishna When is the pool close method called?

[GHkrishna]

@GHkrishna When is the pool close method called?

Pool close from the IndyVDR is not initiated for now as it needs to be fixed first.

For now, we are just resetting the pool variable, as if the pool was never initialized. But since we know we did, we'll reuse the same pool.

[sairanjit]

Yes @GHkrishna We have to close the pool. We can do that by subscribing to the stop$ subject.