docs: add Snowflake connector example guide

[vishwajayawickrama]

Purpose

Adds a step-by-step example guide for the Snowflake connector, covering connection setup and the Query operation with embedded screenshots.

Goals

• Provide a complete walkthrough for configuring the Snowflake connector in the WSO2 Integrator low-code canvas
• Include annotated screenshots at each key configuration step

Approach

Content generated by the connector-docs-automations pipeline. Example page preview screenshots are included at the bottom of this description.

Release note

Added Snowflake connector example guide showing how to configure the Query operation using the WSO2 Integrator low-code canvas.

Documentation

• en/docs/connectors/catalog/database/snowflake/example.md (added)
• en/static/img/connectors/catalog/database/snowflake/ (screenshots added)
• en/sidebars.ts (sidebar entry added)

Security checks

• Followed secure coding standards: N/A (documentation only)
• Ran FindSecurityBugs plugin: N/A (documentation only)
• Confirmed no keys, passwords, or secrets committed: yes

Doc page preview (desktop)

Playwright screenshots of the rendered example page taken locally.

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[gayaldassanayake]

Is "low code canvas" the correct terminology? @rosensilva @NipunaRanasinghe

[gayaldassanayake]

I'm not sure this is the ideal place to have the Deploy button. It is likely to go unnoticed.

My gut feeling is its better to have it at the top. Between the "What you'll build" and "Architecture" headings, under a new heading - "Try it yourself".

WDYT @daneshk @rosensilva @NipunaRanasinghe ?

[vishwajayawickrama]

How about same place but with "Try it yourself" H2 Heading

[gayaldassanayake]

Overall this looks great!!!

Added a few comments for potential minor improvements