ci: remove redundant build and test workflow

Deletes the basic build_and_test.yml to avoid duplication with more specialized CI pipelines and security scanners.

.github/workflows/build_and_test.yml

@@ -1,21 +0,0 @@
-name: Build and Test
-
-on:
-  push:
-    branches: [ "main" ]
-  pull_request:
-    branches: [ "main" ]
-
-env:
-  CARGO_TERM_COLOR: always
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v6
-    - name: Build
-      run: cargo build --verbose
-    - name: Run tests
-      run: cargo test --verbose