Updates to configuring default setup for a repository section in configuring-default-setup-for-code-scanning.md

[VimalaMoger]

Document url:
https://docs.github.com/en/code-security/code-scanning/enabling-code-scanning/configuring-default-setup-for-code-scanning

Why:

In Configuring default setup for a repository section:
The content looks like has not been updated. So I am trying to fix it

What's being changed (if available, include any code snippets, screenshots, or gifs):

1. Removed the step 4 in code-scanning-enable.md
2. Updated Code Security to Code Scanning in product.yml(prodname_code_security)
3. Swapped the screenshots in configuring-default-setup-for-code-scanning.md file(Configuring default setup for a repository)

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

[github-actions]

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Table of review links

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Source	Review	Production	What Changed
code-security/code-scanning/enabling-code-scanning/configuring-default-setup-for-code-scanning.md	fpt ghec ghes@ 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.17 3.16 3.15 3.14

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🤖 This comment is automatically generated.

[Sharra-writes]

@VimalaMoger This looks correct to me. Thanks for the update!

[github-actions]

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