test: run e2e on go.mod, go.sum and modules.txt

before **.go file are added in path changes condition
to run e2e tests but if go.sum, go.mod or modules.txt
changes, e2e test doesn't run. this commit adds them
in path changes.

Signed-off-by: Zaki Shaikh <zashaikh@redhat.com>

Author: zakisk

.github/workflows/e2e.yaml

@@ -23,6 +23,7 @@ on:
       - "**.go"
       - ".github/workflows/**"
       - "test/testdata/**"
+      - "vendor/**"
 
 jobs:
   e2e-tests: