Improve Container Env Comparison in FuncTests

[gmfrasca]

Description of your changes:

Add context to container env divergence test failures, Rather than give a vague message that is difficult to triage fix.

Testing instructions

Add an env var name+value entry in one of the deployment.yamls used for verification in functional tests, such as controllers/testdata/declarative/case_0/expected/created/apiserver_deployment.yaml. Verify that the error message now shows the number of env vars both expected and experienced, as well as a detailed report of which one is missing.

Repeat but this time remove one of the expected env vars instead.

Checklist

• The commits are squashed in a cohesive manner and have meaningful messages.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work

[dsp-developers]

A new image has been built to help with testing out this PR: quay.io/opendatahub/data-science-pipelines-operator:pr-463
An OCP cluster where you are logged in as cluster admin is required.

To use this image run the following:

cd $(mktemp -d)
git clone git@github.com:opendatahub-io/data-science-pipelines-operator.git
cd data-science-pipelines-operator/
git fetch origin pull/463/head
git checkout -b pullrequest 797077f748ba9b8119bda3d1c49714f2c2a03904
make deploy IMG="quay.io/opendatahub/data-science-pipelines-operator:pr-463"

More instructions here on how to deploy and test a Data Science Pipelines Application.

[DharmitD]

/lgtm
/Approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: DharmitD

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