(feature) arbitrary base-version specification for mermaid upgrade-graph output

[grokspawn]

Description of the change: Provide the capability to pass a "start version" to serve as the smallest version to be included in a mermaid-format upgrade-graph render (... and then deal with the ripples through existing code/patterns).

Motivation for the change:

Reviewer Checklist

• [ ] Implementation matches the proposed design, or proposal is updated to match implementation
• [ ] Sufficient unit test coverage
• [ ] Sufficient end-to-end test coverage
• [ ] Docs updated or added to /docs
• [ ] Commit messages sensible and descriptive

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: grokspawn

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[codecov[bot]]

Codecov Report

Merging #1013 (cc409c7) into master (d166a49) will decrease coverage by 0.10%. The diff coverage is 48.43%.

:exclamation: Current head cc409c7 differs from pull request most recent head df2ec23. Consider uploading reports for the commit df2ec23 to get more accurate results

@@            Coverage Diff             @@
##           master    #1013      +/-   ##
==========================================
- Coverage   51.78%   51.67%   -0.11%     
==========================================
  Files         102      102              
  Lines        9105     9153      +48     
==========================================
+ Hits         4715     4730      +15     
- Misses       3488     3515      +27     
- Partials      902      908       +6     

Impacted Files	Coverage Δ
alpha/declcfg/write.go	65.27% <48.43%> (-17.02%)	:arrow_down:

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[grokspawn]

Going back to WIP to consider an alternative implementation approach Joe and I discussed out-of-band.

[bentito]

This PR describes it two different ways: specify a "base version" or specify a "start version", but I'm still not clear on what's being specified. Could you attach one of the created images here maybe that will make it clear?

[bentito]

This PR describes it two different ways: specify a "base version" or specify a "start version", but I'm still not clear on what's being specified. Could you attach one of the created images here maybe that will make it clear?

Oh okay the minimum-edge terminology and explanation make me understand what's going on much better now.

[oceanc80]

/lgtm