fix: avoid duplicate STL listeners when multiple instances exist #480
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What does this PR do?
prevent STL from registering multiple listeners. Helps where VSCode leaves long-running multiple STL instances around and listeners aren't getting cleaned up.
What issues does this PR fix or reference?
@W-14157566@
forcedotcom/cli#2441
forcedotcom/cli#2458
forcedotcom/cli#2483
forcedotcom/cli#2476
and, I think, forcedotcom/cli#2439