docs(tutorials): sync tutorial .tf files with provider 3.20.0

[adela-bytebase]

Summary

Syncs the tutorial sample .tf files to the 3.20.0 schema changes. Paired with the docs.bytebase.com PR: https://github.com/bytebase/bytebase.com/pull/65

Changes (verified against migration/3.20.0.md, provider/data_source_setting.go, and the bytebase review_config_service.proto):

• 3-projects.tf — issue_labels.color string → RGB color {} block (colors are now google.type.Color; red/green/blue floats in [0,1]). #0066CC → (0, 0.4, 0.8), #CC6600 → (0.8, 0.4, 0).
• 5-sql-review.tf — STATEMENT_MAXIMUM_LIMIT_VALUE is one of the 7 SQL review rules removed in 3.20.0 (reserved at review_config_service.proto:224). Replaced with STATEMENT_INSERT_ROW_LIMIT (kept; PostgreSQL-supported; same number_payload shape).

Not applicable to these samples (no occurrences): the maximum_role_expiration_in_seconds rename, announcement level→theme, environment colors, and Vault token_type.

Test plan

• terraform plan on the Part 3 and Part 5 samples succeeds against a 3.20.0 workspace

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