Revert suppression of sqlglotrs warnings

[rolandwalker]

Description

Revert suppression of sqlglotrs warnings, since we are committed to sqlglot 30.x, which has a better fix upstream.

Reverts #1710.

xref tobymao/sqlglot#7290

Checklist

• I added this contribution to the changelog.md file.
• I added my name to the AUTHORS file (or it's already there).
• To lint and format the code, I ran

  uv run ruff check && uv run ruff format && uv run mypy --install-types .

[github-actions]

No correctness or security issues found in this PR diff.

Finding (test gap)

1. Missing regression test for import-time warning behavior after removing suppression in:

   • mycli/main.py
   • mycli/packages/parseutils.py
   • mycli/packages/hybrid_redirection.py

   Action: add a test that imports these modules (or CLI entrypoint) under the pinned sqlglot[c] ~= 30.0.0 and asserts no UserWarning is emitted. This protects against future upstream regressions.

Assumption

• This change is safe as long as dependency resolution continues to enforce sqlglot 30.x from pyproject.toml.

Verification gap

• I could not run tests in this environment because pytest/uv are unavailable.