Snowflake Apps: fix service SQL identifier handling

[sfc-gh-gbloom]

Pre-review checklist

• I've confirmed that instructions included in README.md are still correct after my changes in the codebase.
• I've added or updated automated unit tests to verify correctness of my new code.
• I've added or updated integration tests to verify correctness of my new code.
• I've confirmed that my changes are working by executing CLI's commands manually on MacOS.
• I've confirmed that my changes are working by executing CLI's commands manually on Windows.
• I've confirmed that my changes are up-to-date with the target branch.
• I've described my changes in the release notes.
• I've described my changes in the section below.
• I've described my changes in the documentation.

Changes description

• Use SQL-safe identifier form for DESCRIBE APPLICATION SERVICE lookups.
• Use SQL-safe quoting for application service log retrieval calls.
• Update upgrade-timeout guidance to reference the fully-qualified service name.
• Add regression coverage for the fully-qualified timeout hint.