Add go mod vendor check to integration test

[ChenYi015]

Purpose of this PR

Proposed changes:

• Add go mod vendor check to integration test

Change Category

• Bugfix (non-breaking change which fixes an issue)
• Feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that could affect existing functionality)
• Documentation update

Rationale

[ChenYi015]

/assign @cheyang

[cheyang]

go mod tidy && go mod vendor

[ChenYi015]

@cheyang There already is a step for checking go mod tidy, see:

arena/.github/workflows/integration.yaml

Lines 30 to 36 in 29b2d6d

	- name: Run go mod tidy
	run: |
	go mod tidy
	if ! git diff --quiet; then
	echo "Please run 'go mod tidy' to add missing and remove unused dependencies"
	exit 1
	fi

[cheyang]

Ok

[cheyang]

/lgtm
/approve

[google-oss-prow]

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