Docs: Improve the application security testing "Getting started" docs content

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Problem to solve

Update and improve the content of the Get started securing your application docs page.

Further details

Issues to be addressed include:

• Code scanning is mentioned but not behavior testing.
• The complete vulnerability management workflow should be described.
• The page should direct users to the rollout guide after they've completed the beginner-level activities.
• The recommended application security tools recommended is different to that agreed on by product managers and documented at https://docs.gitlab.com/user/application_security/detect/roll_out_security_scanning/#security-application-security-testing-order.

Proposal

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