fix: snowflake query string builder should follow timezone information from Arrow.

[ZhitongYan]

Issue #, if available:
N/A (or add issue number if there's a related GitHub issue)

Description of changes:
Fix timezone handling in Snowflake connector timestamp formatting for WHERE clauses

Problem:
The SnowflakeQueryStringBuilder was not respecting timezone information when formatting timestamps for SQL WHERE clauses. This could lead to incorrect query results when timestamp data includes timezone information, as the formatter would use the system default timezone instead of the data's actual timezone.

Solution:

• Extract timezone information from ArrowType.Timestamp objects
• Default to "UTC" when timezone is null or empty
• Apply the correct timezone to SimpleDateFormat before formatting timestamps

Changes:

• Modified getObjectForWhereClause() method in SnowflakeQueryStringBuilder.java to handle timezone-aware timestamp formatting
• Added comprehensive test cases covering:
  • Timestamps with null timezone (defaults to UTC)
  • Timestamps with explicit UTC timezone
  • Timestamps with various timezone formats (PST, America/Los_Angeles, GMT-8:00)

Testing:
Added unit tests to verify correct timestamp formatting across different timezone scenarios, ensuring the formatted timestamps reflect the proper timezone conversion.

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[amazon-inspector-n-virginia]

⏳ I'm reviewing this pull request for security vulnerabilities and code quality issues. I'll provide an update when I'm done

[amazon-inspector-n-virginia]

⏳ I'm reviewing this pull request for security vulnerabilities and code quality issues. I'll provide an update when I'm done

[amazon-inspector-n-virginia]

✅ I finished the code review, and didn't find any security or code quality issues.

[amazon-inspector-n-virginia]

✅ I finished the code review, and didn't find any security or code quality issues.

[burhan94]

Hi

Thank you for the contribution. We're you able to test this via Athena?

[burhan94]

Requested a member of the Trianz team to also test this out.

[burhan94]

Hi,

can you provide a repro of how to trigger this issue from Athena? Trianz team was not able to hit this codepath at all.

[burhan94]

Hi @ZhitongYan can you pls take a look at my question above?

[ZhitongYan]

I did not tested in Athena Console, but was running unit tests in my fresh workspace with system default timezone which led to the unit tests failures.

[burhan94]

closing in favor of: #2997