fix(schema-plugin): remove the logic that automatically converts table names to lowercase when getTable

[PeachThinking]

… when getTable

What type of PR is this?

What this PR does / why we need it:

remove the logic that automatically converts table names to lowercase when getTable

Which issue(s) this PR fixes:

Fixes #2239

Special notes for your reviewer:

Additional documentation e.g., usage docs, etc.: