update getConnector to follow existent c1 implementation

[luisina-santos]

Since we want to containerize baton-tableau I'm trying to follow existent c1 pattern that parses the given url before create the connector and force a default api version to 3.19 to keep this behavior after update

https://github.com/ductone/c1/blob/main/pkg/connector/tableau/tableau.go#L29-L36

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch luisinasantos/match-c1-behavior

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