Returns filesToIgnore in the output of @gitstart/gitslice-ignore

[ishmam-mahmud]

Currently the output is just

type GitSliceOutput = {
  filesToSlice: string[]
}

which is useful for figuring out what to slice, and indeed to copy only those files and create a folder containing just the sliced repo during git slice operations.

However, we need filesToIgnore: string[] as well. This should return the list of files in the given repo that should be ignored and not sliced.

This will be useful for the following use cases:

• git-slice-tools implements pull operations by identifying that list by itself, and then deleting those files. Without filesToIgnore in the output, using the library is harder for git slice tools.
• a future gitslice pull command in the CLI could implement the git-slice-tools method of a pull operation, where it identifies the filesToIgnore and deletes them
• In push operations, git-slice-hooks needs this list for a check. In this check, it ensures that none of the ignore files get accidentally modified in any way, by running git reset on them. If it only has access to filesToSlice this is much harder