Fix debounced specs in geo_node and geo_replicable

In #213378 we will be investigating a solution to mocking the lodash debouce function in specs. Once that is complete we can fix the debounce specs in geo_node and geo_replicable.

The following discussion from !28637 (merged) should be addressed:

• @ekigbo started a discussion: (+7 comments)

  Removed because I dont think we need to test how the debounce function works, ensuring that fetchSyncNamespaces gets called should suffice.