[Bug] Manifest upgrade_schema_version needs to process v11 manifests

[jtcohen6]

Is this a new bug in dbt-core?

• I believe this is a new bug in dbt-core
• I have searched the existing issues, and I could not find an existing issue for this bug

Current Behavior

Try running a command on dbt-core main using --state from v1.7:

mashumaro.exceptions.MissingField: Field "unit_tests" of type Mapping[str, UnitTestDefinition] is missing in WritableManifest instance

Expected Behavior

Don't see this error. Support backwards compatibility for v1.7-produced manifests (v11).

Steps To Reproduce

1. Create a manifest using dbt-core v1.7, and stick in state/ directory
2. Switch to dbt-core v1.8.0-a1 (main)
3. Run any command which uses state: dbt ls -s state:modified --state state/
4. See the error

Relevant log output

No response

Environment

- OS: macOS 13.4.1
- Python: 3.10.11
- dbt: main

Which database adapter are you using with dbt?

No response

Additional Context

No response