[RLlib] Renaming all ConnectorV2 example scripts (removed the prefix "connector_v2_" as it is superfluous).

[sven1977]

Renaming all ConnectorV2 example scripts (removed the prefix "connector_v2_" as it is superfluous given that these are all in the connectors sub folder). Analogous to all other example scripts, which also do NOT start with a prefix, b/c they are all already located in the correctly named directory.

Why are these changes needed?

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• I've signed off every commit(by using the -s flag, i.e., git commit -s) in this PR.
• I've run scripts/format.sh to lint the changes in this PR.
• I've included any doc changes needed for https://docs.ray.io/en/master/.
  • I've added any new APIs to the API Reference. For example, if I added a
    method in Tune, I've added it in doc/source/tune/api/ under the
    corresponding .rst file.
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• Testing Strategy
  • Unit tests
  • Release tests
  • This PR is not tested :(

[simonsays1980]

LGTM. Just renaming.