Updates scope for read_api token

What does this MR do?

Updates the scope for the linting endpoint to allow access to read_api. More context here: https://gitlab.com/gitlab-org/security/gitlab/-/issues/354 (internal)

Conformity

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• I have added/updated documentation, or it's not needed. (Is documentation required?)
• [-] I have properly separated EE content from FOSS, or this MR is FOSS only. (Where should EE code go?)
• [-] I have added information for database reviewers in the MR description, or it's not needed. (Does this MR have database related changes?)
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• This MR does not harm performance, or I have asked a reviewer to help assess the performance impact. (Merge request performance guidelines)
• I have followed the style guides.
• This change is backwards compatible across updates, or this does not apply.