amazon-aurora / babelfish_extensions / 12027754134

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Fix resetting some GUCs at the time of TDSResetConnection (#3096)

Some GUCs had an issue with being reset at time of TDSResetConnection:

1. Explain GUCs, they were not getting setting reset after TDSResetConnection. To fix this we need to reset it at time TDSResetConnection AND also at time of sys.sp_reset_connection execution(which would otherwise have given explain output).
2. ANSI_DEFAULTS and IMPLICIT_TRANSACTION related GUCs. These were getting set when driver sends some TDS flags. But after ResetConnection they were being rolled-back. To avoid this we implement TdsResetLoginFlags a wrapper to Re-ProcessLoginFlags.
3. We restrict the setting and re-setting of important GUCs like "babelfishpg_tsql.migration_mode" and "role", since once set, cannot be reset.

Issues Resolved:
BABEL-5280, BABEL-5276, BABEL-5278

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