pipeline step view: export env vars as export script

[jstrachan]

when debugging locally a step that fails, it'd be super nice if there was a quick way to turn all the env vars into a shell script for copy/paste into a terminal!

e.g. a button/link to view the env vars as a shell script.

e.g. for this page..

have a way to show that as text...

export APP_NAME="foo"
export BRANCH_NAME="PR-3"
...

[jenkins-x-bot]

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/lifecycle stale

[jenkins-x-bot]

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Mark the issue as fresh with /remove-lifecycle rotten.
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/lifecycle rotten

[jstrachan]

FWIW we've a CLI command for this now: https://jenkins-x.io/v3/develop/reference/jx/pipeline/env/