Don't allow requirements.txt and renv.lock files to be excluded from projects

[kgartland-rstudio]

You can exclude the requirements.txt and renv.lock files in the Project Files section, subsequent deployments fail when trying to read such files in Connect.

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• Add a pre-flight check to ensure the package file is included Superseded by a separate issue Correctly error when missing required files from bundle #2566
• Add a warning in the sidebar when the package file is not included in the selected configuration
• Disallow the Files API from removing the package files
• Disable the checkboxes in the Project Files view (done in Disable ProjectFile checkbox when it is a package file #2555)

[dotNomad]

There is a pre-flight check already for the inclusion of the Python.PackageFile:

publisher/internal/clients/connect/capabilities.go

Line 69 in a7429cb

err := checkRequirementsFile(base, cfg)

[dotNomad]

Using the same method for checking for package file inclusion for R is not recommended as it has an issue with wildcard inclusions #2563