Test topological sort

[oddegen]

Changes proposed in this pull request:

• Edge cases tests for pgr_topologicalSort

@pgRouting/admins

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[cvvergara]

This test is irrelevant, you are testing what you are selecting in the query above.

[cvvergara]

Thanks we appreciate the effort

As the PR is focused on unit tests:

1. you have many irrelevant tests
2. comments of how the graph looks preferably in graphviz format
3. This looks more like working as: create a graph, run the code, use the results as the test
4. Missing tests like what happens when the graph is not DAG
5. Maybe find an internet example

Remove the irrelevant tests for this PR to be merged.

The noise from the locale directory will disappear (hopefully)

[oddegen]

@cvvergara I have removed the irrelevant tests