chore(git): remove e2e from dockerignore (#1782)

This commit removes e2e from dockerignore file as it is required while
building the test image for running the e2e tests downstream
Ref: https://github.com/openshift-power-monitoring/kepler/blob/main/e2e/Dockerfile

Signed-off-by: vprashar2929 <[email protected]>

Author: vprashar2929

.dockerignore

@@ -1,5 +1,4 @@
 ./_output/
 ./ansible/
-./e2e/
 ./enhancements/
 ./manifests/