OPCT-366: docs/pre-install: added decision graph to user guide

[mtulio]

What this PR does / why we need it:

The changes introduced in this PR documents the current valid scenarios for users applying to VCSP. Recommendations must be aligned with PTAM and Program manager.

Added decision tree to the User Guide to ensure users are installing correctly.

Which issue(s) this PR fixes (optional, use fixes #<issue_number>(, fixes #<issue_number>, ...) format, where issue_number might be a GitHub issue, or a Jira story:
Fixes #

Checklist

• Subject and description added to both, commit and PR.
• Relevant issues have been referenced.
• This change includes docs.
• This change includes unit tests.

[openshift-ci]

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[mtulio]

[mtulio]

[mtulio]

We are pausing this PR waiting for definition of Platform None deprecation definition and openshift-install path that should not be exposed for VCSP User guide.

[openshift-merge-robot]

PR needs rebase.

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