Fix azmcp deploy plan get docs to match POCO options

[Copilot]

azmcp-commands.md still documented --workspace-folder for azmcp deploy plan get, but PR #3143 removed WorkspaceFolder from tools/Azure.Mcp.Tools.Deploy/src/Options/Plan/GetOptions.cs.

Changes

• Removed --workspace-folder from the azmcp deploy plan get usage block.
• Bracketed --target-app-service, --provisioning-tool, and --source-type as optional — ProjectName is the only required property in GetOptions.cs; the rest carry DefaultValues.
• Left azmcp deploy app logs get --workspace-folder untouched; that option still exists in LogsGetOptions.cs.

azmcp deploy plan get --project-name <project-name> \
                      [--target-app-service <target-app-service>] \
                      [--provisioning-tool <provisioning-tool>] \
                      [--source-type <source-type>] \
                      [--iac-options <iac-options>] \
                      [--deploy-option <deploy-option>] \
                      [--resource-group <resource-group>] \
                      [--subscription <subscription>]

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• Fixes [Doc Gap] azmcp deploy plan get — --workspace-folder removed from code but still documented in azmcp-commands.md #3147

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