Fix line comments in literal column names

[puneetdixit200]

Fixes #10868.

Summary

• Clear Vitess-captured raw select expression text when an unaliased projection includes SQL comments outside quotes
• Add regression coverage for NULL, numeric, and string literals with trailing line comments

Verification

• CGO_CPPFLAGS=-I/opt/homebrew/opt/icu4c@78/include CGO_LDFLAGS=-L/opt/homebrew/opt/icu4c@78/lib go test ./cmd/dolt/commands -run TestSqlLiteralColumnNamesIgnoreTrailingLineComments -count=1
• CGO_CPPFLAGS=-I/opt/homebrew/opt/icu4c@78/include CGO_LDFLAGS=-L/opt/homebrew/opt/icu4c@78/lib go test ./cmd/dolt/commands -run 'TestSql|TestSqlBatchMode|TestSqlSelect' -count=1\n- CGO_CPPFLAGS=-I/opt/homebrew/opt/icu4c@78/include CGO_LDFLAGS=-L/opt/homebrew/opt/icu4c@78/lib go test ./cmd/dolt/commands -skip TestSignAndVerifyCommit -count=1\n- git diff --check\n\nNote: the unskipped full package run fails locally because TestSignAndVerifyCommit requires gpg, which is not installed in this environment.

[zachmu]

Thanks for the contribution.

This change is in the right direction, but this fix is applied at the wrong place. We don't want to do this processing in the dolt SQL shell, as that doesn't fix the underlying problem of column names at the server layer. Rather, this fix should take place in dolthub/vitess at the same time that we capture the query text for column aliasing purposes.