fix(cli): backtick-quote BigQuery rows alias in list-tables query

[Tyagiquamar]

Fixes #3331.

\evidence tables\ / \evidence schema\ always fail against a BigQuery direct connector: the introspection query aliases
ow_count AS rows, and
ows\ is a BigQuery reserved keyword, so the query never parses (\Syntax error: Unexpected keyword ROWS). Backtick-quote the alias, as the reporter confirmed by hand (\AS \
ows\\ returns rows correctly).

Validation (Docker node:22-bookworm, pnpm 9.15.0, ext4 clone):

• New regression test in cli/cli/connection/index.test.ts fails on base source (1 failed / 17 passed) and passes with the fix (18/18).
• tsc -p tsconfig.cli.json exit 0; eslint clean on both changed files; prettier core-options check clean (repo-config prettier run is blocked by the pre-existing generated file cli/src/routes/layout.css, which is absent from fresh clones and unrelated to this diff).

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