Add multiple examples in the common and customization sections and add some images.

Closes #3431247

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• 50bd9b58 - Corrected image paths.

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• 985132e4 - Extra info on testing MRs.

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• 985132e4...5ee66658 - 3 commits from branch project:main
• 4f8a0ea0 - Merge branch gitlab_templates:main into 3431247-update-common-tasks

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• 71a6793f - Add words.

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• c7ce51f8 - Changelog.

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• 70fc6551 - More words.

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merged