Rewrite Stream queries that query by schema_name

[maxenglander]

Description

Tabletserver Execute() replaces bindVars[BvSchemaName] with the tablet
database name. In practice this means that queries like:

SELECT * FROM INFORMATION_SCHEMA.SCHEMATA WHERE SCHEMA_NAME = 'data';

are rewritten to queries like:

SELECT * FROM INFORMATION_SCHEMA.SCHEMATA WHERE SCHEMA_NAME = 'vt_data';

Tabletserver Stream() does not replicate this
behavior, breaking queries like the one above when workload is OLAP.

This PR applies the schema-name-replace logic to Stream() calls.

Related Issue(s)

Fixes #11081.

Checklist

• "Backport me!" label has been added if this change should be backported
• Tests were added or are not required
• Documentation was added or is not required

Deployment Notes

[vitess-bot]

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[frouioui]

That looks good to me. I'll let someone else with more knowledge about the query engine (cc @harshit-gangal) review and merge this though.

[harshit-gangal]

changes looks good.
Lets add and e2e test here go/test/endtoend/vtgate/gen4/system_schema_test.go
in TestDbNameOverride

you can set the workload first using the set command and then call the same information_query again.
use the helper method utils.Exec

[maxenglander]

Thanks @harshit-gangal I've added that test