decode secret values

[Gkrumbach07]

closes: #1110

Description

added a prop too pass a function into the env field that applies the function before submitting

How Has This Been Tested?

1. Have a project
2. Create a Workbench
3. Env Vars => Secret => Upload Secret
4. Drag and drop a secret file (you can grab this from OpenShift Console and save it as a file in it's encoded state)

Test Impact

bug fix -> no new tests

Request review criteria:

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• Included tags to the UX team if it was a UI/UX change.
• 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
• The developer has added tests or explained why testing cannot be added (unit tests & storybook for related changes)

[andrewballantyne]

Perfect, thanks for the quick fix!

[openshift-ci]

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