Remove (deprecated) strings from ProjectType

What does this MR do?

This MR removes "(deprecated)" strings from the GraphQL ProjectType.

ProjectType had "(deprecated)" added to the description of some of its fields in d1451e7b. These were added because the same properties had been deprecated in the REST Projects API in favor of properties called {x}_access_level #211620 (comment 315174858).

As the GraphQL ProjectType does not have such fields, the fields that had "(deprecated)" added to their descriptions were never actually deprecated.

This MR removes those strings, and also makes the descriptions more consistent according to the styleguide for descriptions

Descriptions of GraphQL::BOOLEAN_TYPE fields should answer the question: “What does this field do?”. Example: 'Indicates project has a Git repository'.

• Issue: #211620 (closed)

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content

Availability and Testing

• [-] Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• [-] Tested in all supported browsers
• [-] Informed Infrastructure department of a default or new setting change, if applicable per definition of done