WIP: remove test/flpSandbox.html from fiori-*-writers in favor of preview middleware

[heimwege]

Modify the fiori--writers in the open-ux-tools to not generate the test/flpSandbox.html anymore and add the preview middleware to the ui5.yaml files (v0.3)

todo: use

import { FileName, readUi5Yaml } from '@sap-ux/project-access';
//FileName.Ui5Yaml, FileName.Ui5MockYaml, FileName.Ui5LocalYaml

instead of yaml

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[heimwege]

@tobiasqueck is that what you had in mind for #971: Modify the fiori-*-writers in the open-ux-tools to not generate the test/flpSandbox.html anymore and add the preview middleware to the ui5*.yaml files (v0.3) or did I misunderstand this task?

[tobiasqueck]

@heimwege yes, it goes in the right direction. Please check with @ytpo-lyne because she is working on providing the add preview middleware as reusable functionality that you should use here to update the yamls.