update git.listfiles to list files in .insomnia directory

[PatrickMurrell]

changelog(Fixes): Fixed an issue where insomnia would take longer to calculate file changes on Git Sync depending on the size of the Git repository

I noticed in my own working with Insomnia git sync that the git.listfiles method seems to pull all the files in the entire git repository. and runs them through a for loop in the getGitChanges function. This makes the repository I am trying to use insomnia with take 3 minutes to calculate what files were changed and can be committed. Limiting the git.listfiles to the .insomnia directory seems to speed up the load time of this part of the program dramatically. This should address the following open issues #5551 #3269

Closes #5551
Closes #3269

[filfreire]

@PatrickMurrell thanks for contributing this.

This change seems to cause a side-effect - where some changes, like deleting a unit test, are not reflected when preparing a commit:

Example in develop:

Example in this branch:

[PatrickMurrell]

@filfreire So looking at the source code of isomorphic git that function doesn't actually do the filtering of the git repository for you. It just results in the git repo returning nothing. I added a new commit that will filter the results manually and it seems to account for the scenario you brought up when deleting requests

[filfreire]

@PatrickMurrell your last change seems to do the trick, LGTM

[gatzjames]

Left a cleanup suggestion to make it easier to reason on the types of files returned.
Note: This will come back when we revisit the git sync filesystem

[filfreire]

@PatrickMurrell if you haven't already, you can claim a free tshirt for this PR contribution - find more at https://konghq.com/community/open-source-contribution