docs: add sm_utils pages and fix semantic metric catalog docs

[lordhumunguz]

Adds a minimal docs section for sm_utils (index + table stubs), fixes semantic metric catalog docs wording around filter_condition and trailing windows, and updates docs.json nav.\n\nNote: This branch is referenced by reporting_queries PR fix/semantic-metadata-docs via submodule pointer.

Summary by CodeRabbit

Release Notes

• Documentation
  • Enhanced metric filter descriptions with clearer documentation of NULL cases
  • Added comprehensive guides for new utility tables: daily currency conversion rates, date dimensions, and country reference data
  • Organized utility resources under a new "Utility Tables" navigation section for easier discovery
  • Clarified Cost Per Acquisition (CPA) metric definition

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📝 Walkthrough

Walkthrough

This pull request adds new documentation for utility tables (dim_dates, currency_conversion_rates_daily, geo_countries), updates the navigation structure to expose these tables, and refines existing metric documentation descriptions for clarity and consistency.

Changes

Cohort / File(s)	Summary
Metric Documentation Clarifications data-activation/data-tables/sm_metadata/dim_semantic_metric_catalog.mdx, onboarding/data-docs/metrics.mdx	Updated descriptions to clarify filter_condition extraction behavior and CPA metric definition, with minor grammatical adjustments (e.g., "30 day" → "30 days").
New Utility Table Documentation data-activation/data-tables/sm_utils/currency_conversion_rates_daily.mdx, data-activation/data-tables/sm_utils/dim_dates.mdx, data-activation/data-tables/sm_utils/geo_countries.mdx	Added new MDX documentation files describing three utility tables: daily FX conversion rates, shared date dimension, and country reference data, including overview and common use cases.
Utility Tables Navigation data-activation/data-tables/sm_utils/index.mdx, docs.json	Created index documentation page for sm_utils utilities and added "Utility Tables" navigation group to docs.json with links to dim_dates, currency_conversion_rates_daily, and geo_countries.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Poem

🐰 New tables spring forth, organized with care,
Documentation paths now abundant and fair,
From currencies to dates, a reference divine,
Utility tables arranged in a grid so fine! 📊✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main changes: adding sm_utils documentation pages and fixing semantic metric catalog documentation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

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• Commit unit tests in branch fix/reporting-queries-docs

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[lordhumunguz]

Closing since we’re not taking mintlify/docs content changes in this reporting_queries PR; submodule is being pinned to upstream origin/master instead.