Exclude override-snapshot generateName from diff check

[creydr]

Excluding the override-snapshot name from the diff check

[openshift-ci]

@creydr: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/417-operator-e2e	0fcc2af	link	true	/test 417-operator-e2e

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[creydr]

/assign @pierDipi @mgencur

[mgencur]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: creydr, mgencur

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[mgencur]

The validate-lint check fails with:

func ServerlessDowngradeOperations(ctx *test.Context, glob environment.GlobalEnvironment) []pkgupgrade.Operation {
                                                        ^

But that's a left-over from previous PRs.