Revert "refactor(datasources): define ENSNamespaceId enum"

[tk-o]

This reverts changes from PR #804

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[tk-o]

I spoke with @shrugs and we agreed to keep using POJO values when selecting ENSNamespace or DatasourceName.

[shrugs]

If you want to use the enum-like values in the code, though, you can still do ENSNamespaceIds.EnsTestEnv