Reduce Snowflake profiler output size by decoupling query metrics from QUERY_TEXT

[dgomez04]

Summary

This pull request addresses the massive Snowflake profiler extract sizes on high-volume accounts by decoupling metrics tracking from raw SQL text query history. We preserve high-value metrics while drastically reducing the bloat.

Key Changes

• Omit QUERY_TEXT from full-window query_history. Prevents multi-gigabyte SQL text extraction while keeping the exact QUERY_TYPE and performance metrics.
• Introduce query_samples. Extracts a random sample of up to 10,000 rows containing QUERY_TEXT and QUERY_ID (to join back to query_history for downstream migration complexity analysis).
• Drop unused user_activity. Removed the LOGIN_HISTORYdump, which is no longer used by lakebridge_profilers or GVP inputs and was contributing millions of rows of secondary bloat.

Measured Impact

On a sample ~20M-row extract, omitting the raw SQL text yielded dramatic storage and network transfer savings:

Metric	Before	After	Change
Extract Size	~28 GiB	~1 GiB	~96% reduction (28× smaller)

Note. Workload spend-mix classification relies on QUERY_TYPE, not QUERY_TEXT, meaning downstream classification accuracy remains unaffected.

Follow-Ups

• Updated lakebridge-profilers' migration_complexity.sql to read from query_samples instead of query_history.QUERY_TEXT.

Tests

• Execute execute-database-profiler on Snowflake staging/test accounts and verified:
  - [ ] query_history no longer contains query_text
  - [ ] query_samples is limited to $\le$ 10k rows and contains the text.
  - [ ] user_activity table is completely gone.
• Confirm that lakebridge-profilers (after changes) spend-mix path still functions correctly using QUERY_TYPE from query_history.

Closes #2532

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.35%. Comparing base (c1fdb1f) to head (734847c).

Additional details and impacted files

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  Coverage   70.35%   70.35%           
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  Files         107      107           
  Lines        9658     9658           
  Branches     1069     1069           
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  Hits         6795     6795           
  Misses       2655     2655           
  Partials      208      208           

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[github-actions]

✅ 174/174 passed, 2 skipped, 1h40m13s total

_{Running from acceptance #5084}

[gueniai]

LGTM