ci: remove redundant lint.yml workflow (#6622)

.github/workflows/lint.yml

@@ -1,35 +0,0 @@
-name: Lint
-
-# If a pull-request is pushed then cancel all previously running jobs related
-# to that pull-request
-concurrency:
-  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.sha }}
-  cancel-in-progress: true 
-
-on:
-  push:
-    branches:
-      - main
-  pull_request:
-    branches:
-      - main
-      - master
-
-env:
-  PY_COLORS: 1
-
-jobs:
-  lint:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4.1.1
-        with:
-          fetch-depth: 0
-      - name: Install poetry
-        run: pipx install poetry
-      - uses: actions/setup-python@v5.0.0
-        with:
-          python-version: '3.12'
-      - run: poetry install
-      - name: Run flake8 (https://flake8.pycqa.org/en/latest/)
-        run: poetry run flake8 --exclude=tests/