Remove generated symbol tests

[alancai98]

Currently the conformance tests include some tests with generated symbol names following the convention partiql-lang-kotlin and the spec use (using _1, _2,...).

The spec states in section 6.3.1 that

SQL and PartiQL do not provide a standard convention

Since there's no mention of the actual generated names, these conformance tests should be removed or moved to the "extended" directory of tests.

[alancai98]

Tests not explicitly testing the generated name (example test) should probably add aliases so the generated symbols aren't necessary.