Rename disabled_with_override to disabled_and_overridable

What does this MR do and why?

Renaming the underlying setting to improve readability of the generated docs as a follow up to #337124 (closed). The approach is to deprecate disabled_with_override in favour of disabled_and_overridable and to remove disabled_with_override with the next milestone.

The associated deprecation issue: #385636 (closed)

Screenshots or screen recordings

Confirmed the new value was sent in the request:

Querying the gql api shows the new value being used as well.

How to set up and validate locally

Given two groups, one group and one subgroup.

Group can be changed

1. Visit Group -> CI/CD Settings
2. Enable/disable the toggle in the group to check how the data is stored.

Subgroup cannot be changed

1. Enable the "Shared runners" toggle in the group
2. Visit Subgroup -> CI/CD Settings
3. Confirm the form is disabled in the subgroup.

Graphql Query

1. http://gdk.test:3000/-/graphql-explorer
2. Run the following query

{
  group(fullPath: "top-level-group") {
    fullPath
    sharedRunnersSetting
    descendantGroups {
      nodes {
        fullPath
        sharedRunnersSetting
      }
    }
  }
}

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #337124 (closed)