[#1564] .github: Remove assign-to-project action

It doesn't work now and needs to be done differently.

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>

.github/workflows/project.yml

@@ -1,19 +0,0 @@
-name: Add issues to NeoFS Core project
-
-on:
-  issues:
-    types:
-      - opened
-      - transferred
-      - labeled
-
-jobs:
-  add-to-project:
-    name: Add issue to project
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/add-to-project@main
-        with:
-          project-url: https://github.com/orgs/nspcc-dev/projects/1
-          github-token: ${{ secrets.GITHUB_TOKEN }}
-          labeled: triage