ci: Enable verbose output for e2e tests (#797)

**What problem does this PR solve?**:
- Use the E2E_VERBOSE make variable to enable verbose output.
- Remove the CI make variable, because we never used it.

**Which issue(s) this PR fixes**:
Fixes #

**How Has This Been Tested?**:
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Author: dlipovetsky

.github/workflows/e2e.yml

@@ -95,7 +95,7 @@ jobs:
           fi
 
       - name: Run e2e tests
-        run: devbox run -- make e2e-test E2E_LABEL='provider:${{ inputs.provider }} && cni:${{ inputs.cni }} && addonStrategy:${{ inputs.addon-strategy }}' E2E_SKIP='${{ inputs.skip }}' E2E_FOCUS='${{ inputs.focus }}'
+        run: devbox run -- make e2e-test E2E_LABEL='provider:${{ inputs.provider }} && cni:${{ inputs.cni }} && addonStrategy:${{ inputs.addon-strategy }}' E2E_SKIP='${{ inputs.skip }}' E2E_FOCUS='${{ inputs.focus }}' E2E_VERBOSE=true
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           DOCKER_HUB_USERNAME: ${{ secrets.DOCKER_HUB_USERNAME }}

make/go.mk

@@ -75,7 +75,7 @@ bench.%: ; $(info $(M) running benchmarks$(if $(GOTEST_RUN), matching "$(GOTEST_
 	$(if $(filter-out root,$*),cd $* && )go test $(if $(GOTEST_RUN),-run "$(GOTEST_RUN)") -race -cover -v ./...
 
 E2E_DRYRUN ?= false
-E2E_VERBOSE ?= $(filter $(E2E_DRYRUN)$(CI),true) # If dry-run or CI, enable verbosity
+E2E_VERBOSE ?= $(filter $(E2E_DRYRUN),true) # If dry-run, enable verbosity
 E2E_PARALLEL_NODES ?= $(if $(filter $(E2E_DRYRUN),true),1,$(shell nproc --ignore=1)) # Ginkgo cannot dry-run in parallel
 E2E_FLAKE_ATTEMPTS ?= 1
 E2E_CONF_FILE ?= $(REPO_ROOT)/test/e2e/config/caren.yaml