Add tracing hooks for existing connections #3432
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Previously
InstruementTracingwould callnewTracingHookwith no connString as a default tracing hook, but that was recently removed in v9.8.0 which has caused our clients to lose tracing if connections are created before tracing can be instrumented. In #3433, I've reverted the change to remove the default tracing hook, but a potential solution would be to useForEachShardto create tracing hooks for any existing connections. This is a breaking change since it requires context, open to feedback if this PR should be moved forward instead of the revert.