Simplify Github actions

Consolidate build steps to 1 script this way we don't run multiple builds for pushing a branch and create a PR.

.github/workflows/branch_build.yml

@@ -1,52 +0,0 @@
-name: "Branch build"
-on:
-  push:
-    branches-ignore:
-      - master
-      - develop
-      - release/*
-jobs:
-  install-notest:
-    runs-on: ubuntu-latest
-    name: "Package and linting"
-    steps:
-      - uses: actions/checkout@v2
-      - name: set up JDK 16
-        uses: actions/setup-java@v2
-        with:
-          distribution: 'zulu'
-          java-version: 16
-          architecture: x64
-      - name: Cache Maven packages
-        uses: actions/cache@v2.1.5
-        with:
-          path: ~/.m2
-          key: ubuntu-latest-m2-${{ hashFiles('**/pom.xml') }}
-          restore-keys: ubuntu-latest-m2
-      - name: Test with Maven
-        run: mvn install -DskipTests
-
-  testing:
-    needs: install-notest
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        args:
-          - mvn -pl '!webgoat-integration-tests' test
-          - mvn -pl webgoat-integration-tests test
-    steps:
-      - uses: actions/checkout@v2
-      - name: set up JDK 16
-        uses: actions/setup-java@v2
-        with:
-          distribution: 'zulu'
-          java-version: 16
-          architecture: x64
-      - name: Cache Maven packages
-        uses: actions/cache@v2.1.5
-        with:
-          path: ~/.m2
-          key: ubuntu-latest-m2-${{ hashFiles('**/pom.xml') }}
-          restore-keys: ubuntu-latest-m2
-      - name: Test with Maven
-        run: ${{ matrix.args }}