Remove security & compliance config page feature flag [RUN ALL RSPEC] [RUN AS-IF-FOSS]

What does this MR do?

This MR solves #294084 (closed) the secure_security_and_compliance_configuration_page_on_ce flag was removed.

Screenshots (strongly suggested)

no visual changes.

Does this MR meet the acceptance criteria?

Conformity

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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

Security

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• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team