Add test for mix sharding for mutiple tables in SQEBC

[gnahzg]

Summary: As titled

Reviewed By: jingsh

Differential Revision: D54313506

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D54313506

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D54313506

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D54313506

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D54313506

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D54313506

[facebook-github-bot]

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