Drop deprecated sqlfluff recurse config

[sambradbury]

Summary of Changes

Removes a config option deprecated by sqlfluff here.

Why Do We Need These Changes

Removing this option will prevent users from running into errors like the one below while trying to use sqlfluff in a dbt project where dbt-expectations is installed.

==== finding fixable violations ====

User Error: Config file PosixPath('/Users/myusername/Documents/dbt_project/dbt_packages/dbt_expectations/integration_tests/.sqlfluff') set an outdated config value core:recurse.

Removed as unused in production and unnecessary for debugging.

See https://docs.sqlfluff.com/en/stable/perma/configuration.html for more details.

Reviewers

@tpoll @gusvargas

[steveh-101]

Can this be reviewed and merged @tpoll @gusvargas? Hitting this error on latest sqlfluff