perf: add teardown logic for watch

[alan-agius4]

When the observable has complete or errored. The watch should be closed.

I'm submitting a...

[ ] Bug Fix
[ ] Feature
[x] Other (Refactoring, Added tests, Documentation, ...)

Checklist

• Commit Messages follow the Conventional Commits pattern
  • A feature commit message is prefixed "feat:"
  • A bugfix commit message is prefixed "fix:"
• Tests for the changes have been added

Description

apply tier down logic so that when observable completes we close the watcher and thus avoid memory leaks

Does this PR introduce a breaking change?

[ ] Yes
[ ] No

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