Merge | Cleanup Pre 2005 Support in TdsParser (#3206)

* Cleanup Pre 2005 Support in TdsParser

* Fix some code indentation issues

* Fix some code indentation issues

* Add back isVersion8

* PR Comments
- Removing _is2005
- Removing ENV_CHANGE types that are not supported in TDS >7

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Co-authored-by: Michel Zehnder <MichelZ@users.noreply.github.com>
Co-authored-by: Cheena Malhotra <13396919+cheenamalhotra@users.noreply.github.com>

Author: 3 people