ci: remove ci:off flag

- Removing this flag becasue it's not needed for the foreseeable future. `ci:off` was borrowed from the Chaste project's CI to avoid expensive macOS builds when this repo was private, particularly when dependabot changes came once a week. Now the repo is public we no longer incur those costs, and removing this flag makes CI scripts easier to read.

Author: alexallmont

.github/workflows/build-cpp-libs.yml

@@ -5,7 +5,6 @@ on:
     branches:
       - main
   pull_request:
-    types: [opened, synchronize, reopened, labeled, unlabeled]
     branches:
       - '**'
 
@@ -14,7 +13,6 @@ jobs:
   build-libs:
     name: Build C++ libs
     runs-on: ${{ matrix.os }}
-    if: ${{ !contains(github.event.pull_request.labels.*.name, 'ci:off') }}
 
     strategy:
       fail-fast: false

.github/workflows/pytest-ubuntu.yml

@@ -5,7 +5,6 @@ on:
     branches:
       - main
   pull_request:
-    types: [opened, synchronize, reopened, labeled, unlabeled]
     branches:
       - main
   release:
@@ -16,7 +15,6 @@ jobs:
   run_python_tests:
     name: Run python tests on ${{ matrix.python-version }}
     runs-on: ubuntu-latest
-    if: ${{ !contains(github.event.pull_request.labels.*.name, 'ci:off') }}
 
     strategy:
       fail-fast: false