Bump azure-cli version to 2.84.0

[jenkins-infra-updatecli]

Bump `azure-cli` version

Update test harness with new `az` version

change detected: * key "$.commandTests[2].expectedOutput[0]" updated from "\"\\\"azure-cli 2.83.0\\\"\"" to "\"azure-cli 2.84.0\"", in file "./cst.yaml"

azure-cli-2.83.0

https://github.com/MicrosoftDocs/azure-docs-cli/blob/main/docs-ref-conceptual/Latest-version/release-notes-azure-cli.md

### SHA256 hashes of the release artifacts

```
73909c7b05adbfb9f9d5a970ea5ee35908ee97fead25769d102c72271a5e86eb  azure-cli-2.83.0-x64.msi
f14792bdb4ba6ce3768261ee32216f407734bf0fbc2e3ffd33a0a142fabb449f  azure-cli-2.83.0-x64.zip
2b5dccfe9a7522514f032bb346178b5c75130b854d17e70e5a45c31b2613d951  azure-cli-2.83.0.msi
```

azure-cli-2.84.0

https://github.com/MicrosoftDocs/azure-docs-cli/blob/main/docs-ref-conceptual/Latest-version/release-notes-azure-cli.md

### SHA256 hashes of the release artifacts

```
5534b81ec9c826e6f0d38cc9f7640c04d0d8037ffe11ee113723a3682e663485  azure-cli-2.84.0-x64.msi
20c0c54b2a5a9204c0539f696ad89a95dc5b160cd0b08a3999f198c91f84ef08  azure-cli-2.84.0-x64.zip
3b18199b7fd506c4400c91c4c66bbf1ecf489830283e26ca3c3ff175490d2dca  azure-cli-2.84.0.msi
```

Update the value of ARG AZ_VERSION in the Dockerfile

changed lines [3 37] of file "./Dockerfile"

azure-cli-2.83.0

https://github.com/MicrosoftDocs/azure-docs-cli/blob/main/docs-ref-conceptual/Latest-version/release-notes-azure-cli.md

### SHA256 hashes of the release artifacts

```
73909c7b05adbfb9f9d5a970ea5ee35908ee97fead25769d102c72271a5e86eb  azure-cli-2.83.0-x64.msi
f14792bdb4ba6ce3768261ee32216f407734bf0fbc2e3ffd33a0a142fabb449f  azure-cli-2.83.0-x64.zip
2b5dccfe9a7522514f032bb346178b5c75130b854d17e70e5a45c31b2613d951  azure-cli-2.83.0.msi
```

azure-cli-2.84.0

https://github.com/MicrosoftDocs/azure-docs-cli/blob/main/docs-ref-conceptual/Latest-version/release-notes-azure-cli.md

### SHA256 hashes of the release artifacts

```
5534b81ec9c826e6f0d38cc9f7640c04d0d8037ffe11ee113723a3682e663485  azure-cli-2.84.0-x64.msi
20c0c54b2a5a9204c0539f696ad89a95dc5b160cd0b08a3999f198c91f84ef08  azure-cli-2.84.0-x64.zip
3b18199b7fd506c4400c91c4c66bbf1ecf489830283e26ca3c3ff175490d2dca  azure-cli-2.84.0.msi
```

Jenkins pipeline link

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