Only one subscriber for kernels for onDidChangeSelectedNotebooks #204417
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This fixes the issue in #204416 (and microsoft/vscode-jupyter#15075)
This change just switches from each kernel that's added getting its own individual listener to just having a single listener for all the kernels. This way the number of listeners doesn't grow arbitrarily large to the point where it hits a threshold. Alternative solutions could include setting a higher threshold for the leakage monitoring for the relevant
Emitteror failing with a more user-friendly error if there are lots of kernels added, but this seems nicer.