Added CustomConfig to WorkflowController

[hbelmiro]

The issue resolved by this Pull Request:

Resolves https://issues.redhat.com/browse/RHOAIENG-5287

Description of your changes:

Added CustomConfig to WorkflowController.

Testing instructions

Deploy config/samples/v2/custom-workflow-controller-config and run a pipeline. The pipeline must complete successfully.

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-636
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/636/head
git checkout -b pullrequest 3d9bf9cd5b61bde8fde0b526fcc78432da73976c
oc new-project opendatahub
make deploy IMG="quay.io/opendatahub/data-science-pipelines-operator:pr-636"

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

[dsp-developers]

Change to PR detected. A new PR build was completed.
A new image has been built to help with testing out this PR: quay.io/opendatahub/data-science-pipelines-operator:pr-636

[VaniHaripriya]

/lgtm
Deployed config/samples/v2/custom-workflow-controller-config and created a pipeline run. The pipeline completed successfully.

[HumairAK]

/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: HumairAK

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