[ACA] [335221] Add conceptual info for scaling apps vs scaling jobs.

[v-jaswel]

PR review team: please do not review or merge this PR until Craig Shoemaker signs off. Thank you!

[prmerger-automator]

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[learn-build-service-prod]

Learn Build status updates of commit bfb4b7c:

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[learn-build-service-prod]

Learn Build status updates of commit ec3d532:

💡 Validation status: suggestions

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articles/container-apps/jobs.md	✅Succeeded

articles/container-apps/scale-app.md

• Line 807, Column 1: [Suggestion: table-syntax-invalid - See documentation] Table syntax is invalid. Ensure your table includes a header and is surrounded by empty lines.

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[learn-build-service-prod]

Learn Build status updates of commit 3c81ddd:

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articles/container-apps/scale-app.md	✅Succeeded

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[v-dirichards]

#label:"aq-pr-triaged"
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[learn-build-service-prod]

Learn Build status updates of commit 617a173:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/container-apps/jobs.md	✅Succeeded
articles/container-apps/scale-app.md	✅Succeeded

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