Update copy for DAST Profiles library page

Related issue - #355316 (closed)

What does this MR do and why?

Security Configuration Page

https://gitlab.com/gitlab-org/gitlab/-/security/configuration

• Update the title from DAST Scans > DAST profiles
• Update the action button from Manage scans > Manage profiles

Profile Page

https://gitlab.com/gitlab-org/gitlab/-/security/configuration/dast_scans

• Change the title of the destination page from Manage DAST scans > DAST profile library

Screenshots or screen recordings

before	after

before	after

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.