Update multi-project docs for v1.5.0-b5 (March 30)

[jtcohen6]

Contributions

• I have read the contribution docs, and understand what's expected of me.

Link to the page on docs.getdbt.com requiring updates

Contracts:

• https://docs.getdbt.com/docs/collaborate/publish/model-contracts
• https://docs.getdbt.com/reference/resource-configs/contract
• https://docs.getdbt.com/reference/resource-properties/columns
• https://docs.getdbt.com/reference/resource-properties/constraints
• https://docs.getdbt.com/reference/node-selection/methods#the-state-method

What part(s) of the page would you like to see updated?

Contracts:

• model contracts supported for incremental materialization (with on_schema_change), in addition to table + view
• model contract checks - column order agnostic
• updated data structure for constraints
  • enforced vs. unenforced vs. unsupported on different data platforms
  • supported at model level
• detect breaking changes to model contracts during state:modified for column names + data types

Additional information

Release:

• [CT-2318] Release v1.5.0b5 - March 30th dbt-core#7198

Contracts:

• [CT-2038] Detect breaking changes to column names and data types in state:modified check dbt-core#6869
• [CT-2196] Make constraints ddl agnostic to column order dbt-core#7064
• [CT-2198] Unify constraints and constraints_check configs dbt-core#7066
• [CT-2293] Enforce model contracts for incremental materializations  dbt-core#7154
• [CT-2314] [Feature] Do we _have_ to call the boolean property contract? dbt-core#7184

https://www.notion.so/dbtlabs/dbt-Core-v1-5-docs-a2ae11be77bf47629f85faf7a3f27991