feat: ClickHouse warehouse setup UI behind clickhouse_warehouse flag

[Zaimwa9]

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• I have added information to docs/ if required so people know about the feature.
• I have filled in the "Changes" section below.
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Changes

Frontend for the clickhouse warehouse connection type, gated behind the clickhouse_warehouse flag (off by default). Builds on the backend in #8020.

• New ClickHouse config form, visually identical to the Snowflake one: host, name, port, database, username, password and a TLS toggle, with defaults matching the backend. The host is locked when editing; leaving the password blank on edit keeps the stored credentials.
• The warehouse setup flow offers ClickHouse alongside Flagsmith and Snowflake when the flag is enabled.
• The connection card wires the Test connection button for ClickHouse and surfaces the new status_detail field: the status tooltip shows the failure reason when the connection is errored, and the test-connection toast reports it instead of a generic message.
• API layer types updated: write-only credentials, read-only status_detail.

How did you test this code?

Unit tests for the form validation and payload helpers (npm run test:unit -- --testPathPatterns=clickhouseConfig), npm run lint, npm run typecheck (no new errors against the baseline).

Manually: enable the clickhouse_warehouse flag, go to Environment Settings → Warehouse, connect a ClickHouse instance, then edit it and use Test connection to see verification results, including failure reasons.

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Project	Deployment	Actions	Updated (UTC)
flagsmith-frontend-preview	Ready	Preview, Comment	Jul 16, 2026 10:50am
flagsmith-frontend-staging	Ready	Preview, Comment	Jul 16, 2026 10:50am

1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
docs	Ignored		Jul 16, 2026 10:50am

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.65%. Comparing base (f7a302b) to head (af485e8).

Additional details and impacted files

@@                            Coverage Diff                            @@
##           feat/clickhouse-byo-warehouse-backend    #8028      +/-   ##
=========================================================================
- Coverage                                  98.65%   98.65%   -0.01%     
=========================================================================
  Files                                       1507     1508       +1     
  Lines                                      59866    59796      -70     
=========================================================================
- Hits                                       59060    58990      -70     
  Misses                                       806      806              

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