[chore] Replace '-0' and '-1' with semantically meaningful suffixes. Other minor fixes in 'instrumentation-genai' test structure. (#3268)

* Replace '-0' and '-1' with semantically meaningful suffixes.

* Act on feedback in PR 3268.

* Fix typos.

Author: michaelsafyan

.github/workflows/core_contrib_test_0.yml

@@ -19,8 +19,8 @@ env:
 
 jobs:
 
-  py38-test-instrumentation-openai-v2-0:
-    name: instrumentation-openai-v2-0 
+  py38-test-instrumentation-openai-v2-oldest:
+    name: instrumentation-openai-v2-oldest 
     runs-on: ubuntu-latest
     steps:
       - name: Checkout contrib repo @ SHA - ${{ env.CONTRIB_REPO_SHA }}
@@ -39,10 +39,10 @@ jobs:
         run: pip install tox-uv
 
       - name: Run tests
-        run: tox -e py38-test-instrumentation-openai-v2-0 -- -ra
+        run: tox -e py38-test-instrumentation-openai-v2-oldest -- -ra
 
-  py38-test-instrumentation-openai-v2-1:
-    name: instrumentation-openai-v2-1 
+  py38-test-instrumentation-openai-v2-latest:
+    name: instrumentation-openai-v2-latest 
     runs-on: ubuntu-latest
     steps:
       - name: Checkout contrib repo @ SHA - ${{ env.CONTRIB_REPO_SHA }}
@@ -61,10 +61,10 @@ jobs:
         run: pip install tox-uv
 
       - name: Run tests
-        run: tox -e py38-test-instrumentation-openai-v2-1 -- -ra
+        run: tox -e py38-test-instrumentation-openai-v2-latest -- -ra
 
-  py38-test-instrumentation-vertexai-0:
-    name: instrumentation-vertexai-0 
+  py38-test-instrumentation-vertexai-oldest:
+    name: instrumentation-vertexai-oldest 
     runs-on: ubuntu-latest
     steps:
       - name: Checkout contrib repo @ SHA - ${{ env.CONTRIB_REPO_SHA }}
@@ -83,10 +83,10 @@ jobs:
         run: pip install tox-uv
 
       - name: Run tests
-        run: tox -e py38-test-instrumentation-vertexai-0 -- -ra
+        run: tox -e py38-test-instrumentation-vertexai-oldest -- -ra
 
-  py38-test-instrumentation-vertexai-1:
-    name: instrumentation-vertexai-1 
+  py38-test-instrumentation-vertexai-latest:
+    name: instrumentation-vertexai-latest 
     runs-on: ubuntu-latest
     steps:
       - name: Checkout contrib repo @ SHA - ${{ env.CONTRIB_REPO_SHA }}
@@ -105,7 +105,7 @@ jobs:
         run: pip install tox-uv
 
       - name: Run tests
-        run: tox -e py38-test-instrumentation-vertexai-1 -- -ra
+        run: tox -e py38-test-instrumentation-vertexai-latest -- -ra
 
   py38-test-resource-detector-container:
     name: resource-detector-container