fix(Postgres Node): Re-use connection pool across executions #12346
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Summary
This add a connection pool manager similar to the ssh SSHClientsManager for re-using ssh connections.
It's a singleton that lives in the nodes-base package. Adi and I initially tried to make this available through the context (node execution functions) and also have this available to the credentials and have them manage the connections, but this led to changes to the interfaces in the workflow package that would have culminated in a single huge refactor in this PR. Instead we chose this simpler approach that can later be integrated into the context and be made available to the credentials instead of the nodes by further refactors.
Next step is to use the manager for more nodes, e.g. MSSQL and MySQL. This will also fix an issue that at least one cloud customer has with connections to MSSQL being blocked because we connect and disconnect too often when they execute the MSSQL node in a tight loop.
Related Linear tickets, Github issues, and Community forum posts
todo: add help ticket link
Review / Merge checklist
Docs updated or follow-up ticket created.PR Labeled withrelease/backport(if the PR is an urgent fix that needs to be backported)