dvcignore: read ignore patterns from global .dvcignore

[meshde]

Read the patterns from system-level .dvcignore (~/.dvcignore) and include these as part of the default ignore pattern used while initiating the ignore trie

Fixes #8261

• [x] ❗ I have followed the Contributing to DVC checklist.

• [x] 📖 If this PR requires documentation updates, I have created a separate PR (or issue, at least) in dvc.org and linked it here.

[karajan1001]

LGTM, except for the question discussed above. Still need an update on the doc side.

[meshde]

Still need an update on the doc side.

@karajan1001 thank you for the review!

Just raised a PR to update the docs here: https://github.com/iterative/dvc.org/pull/3950

[meshde]

@pmrowla @dtrifiro just updated the code based on your comments.

lmk what you think of these changes.

[meshde]

I'm not sure what's up with the failing Lint check and I'm not able to reproduce it locally.

Any help in resolving that would be highly appreciated 😄

[meshde]

@dtrifiro updated the PR as per your suggestions.

Lmk what you think now.

[shcheklein]

@meshde @iterative/dvc any progress here folks?

[efiop]

Closing as stale. Please feel free to reopen if you'll find time to address https://github.com/iterative/dvc/pull/8280#discussion_r987781992 This change is useful, but we don't have the capacity to take it over ourselves right now.