Backport of docs - add jobs use case for service mesh k8s into release/1.15.x

[hc-github-team-consul-core]

Backport

This PR is auto-generated from #18037 to be assessed for backporting due to the inclusion of the label backport/1.15.

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The person who merged in the original PR is:
@david-yu
This person should manually cherry-pick the original PR into a new backport PR,
and close this one when the manual backport PR is merged in.

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The below text is copied from the body of the original PR.

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Description

Add jobs use case for service mesh on k8s and provides better organization for workload types on the mesh.

Testing & Reproduction steps

Links

PR Checklist

• updated test coverage
• external facing docs updated
• appropriate backport labels added
• not a security concern

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Overview of commits

• 9a65b05 - 2c1b11e - e5ef0d5 - bd9b4e3 - 24df9fa - 8fa9120 - f8a44ec - 8a520f0 - 2087f15 - 4ce328d

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1 out of 2 committers have signed the CLA.

• david-yu
• temp

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[github-team-consul-core-pr-approver]

Auto approved Consul Bot automated PR