Test all matrix configurations (#617)

Add "fail-fast: false" to matrix testing strategies so that they
continue testing other variant instead of auto-canceling them.
For example, if only Node.js v8 fails, we don't want the Node.js v12
job to be canceled. This might be different in future cases, but
everywhere we use "strategy: matrix" now, we'd like all items to be
tested regardless of their siblings' failures.

.github/workflows/test-core.yaml

@@ -37,6 +37,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest]
+      fail-fast: false
     steps:
       - name: Install system dependencies
         run: |

.github/workflows/test-go.yaml

@@ -33,6 +33,7 @@ jobs:
     strategy:
       matrix:
         go: ['1.11.13', '1.12.17', '1.13.8', '1.14']
+      fail-fast: false
     steps:
       - name: Install system dependencies
         run: |

.github/workflows/test-java.yaml

@@ -32,6 +32,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest]
+      fail-fast: false
     steps:
       - name: Install system dependencies
         run: |

.github/workflows/test-nodejs.yaml

@@ -33,6 +33,7 @@ jobs:
           - 8.x   # old LTS
           - 10.x  # current LTS
           - 12.x  # current stable
+      fail-fast: false
     steps:
       - name: Install system dependencies
         run: |

.github/workflows/test-python.yaml

@@ -54,6 +54,7 @@ jobs:
     strategy:
       matrix:
         python: [python2, python3]
+      fail-fast: false
     env:
       PYTHON: ${{ matrix.python }}
     services:

.github/workflows/test-wasm.yaml

@@ -38,6 +38,7 @@ jobs:
           - 8.x   # old LTS
           - 10.x  # current LTS
           - 12.x  # current stable
+      fail-fast: false
     steps:
       - name: Install system dependencies
         run: |