Skip tests for implementations without change

Currently, we run ~50 for each commit. This takes up quite a lot of CI
resources, resulting in long wait times. Typically, (especially with Renovate)
only a single language changes.

.github/workflows/test-c.yml

@@ -5,6 +5,9 @@ on:
     branches:
       - main
       - renovate/**
+    paths:
+      - c/**
+      - testdata/**
   pull_request:
     branches:
       - main

.github/workflows/test-dart.yml

@@ -8,6 +8,9 @@ on:
   pull_request:
     branches:
       - main
+    paths:
+      - dart/**
+      - testdata/**
   workflow_call:
 
 jobs:

.github/workflows/test-dotnet.yml

@@ -5,6 +5,9 @@ on:
     branches:
       - main
       - renovate/**
+    paths:
+      - dotnet/**
+      - testdata/**
   pull_request:
     branches:
       - main

.github/workflows/test-go.yml

@@ -5,6 +5,9 @@ on:
     branches:
       - main
       - renovate/**
+    paths:
+      - go/**
+      - testdata/**
   pull_request:
     branches:
       - main

.github/workflows/test-java.yml

@@ -5,6 +5,9 @@ on:
     branches:
       - main
       - renovate/**
+    paths:
+      - java/**
+      - testdata/**
   pull_request:
     branches:
       - main

.github/workflows/test-javascript.yml

@@ -5,6 +5,9 @@ on:
     branches:
       - main
       - renovate/**
+    paths:
+      - javascript/**
+      - testdata/**
   pull_request:
     branches:
       - main

.github/workflows/test-perl.yml

@@ -5,6 +5,9 @@ on:
     branches:
       - main
       - renovate/**
+    paths:
+      - perl/**
+      - testdata/**
   pull_request:
     branches:
       - main

.github/workflows/test-php.yml

@@ -5,6 +5,9 @@ on:
     branches:
       - main
       - renovate/**
+    paths:
+      - php/**
+      - testdata/**
   pull_request:
     branches:
       - main

.github/workflows/test-python.yml

@@ -8,6 +8,9 @@ on:
     branches:
       - main
       - renovate/**
+    paths:
+      - php/**
+      - testdata/**
   pull_request:
     branches:
       - main

.github/workflows/test-ruby.yml

@@ -5,6 +5,9 @@ on:
     branches:
       - main
       - renovate/**
+    paths:
+      - ruby/**
+      - testdata/**
   pull_request:
     branches:
       - main