Closes #247: bcva crit flag update

[steventing12]

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[github-actions]

Package	Line Rate	Health
admiralophtha	100%	✔
Summary	100% (119 / 119)	✔

[manciniedoardo]

@steventing12 please could you clean up this PR so it only includes the crterion flag updates for #247 and not the updates for #244 ? Otherwise it's hard to review. Thanks

[manciniedoardo]

Thanks for the work @steventing12 - looks like a great start!

Along with the other comments, please could you also go ahead and supersede derive_vars_bcvacritxfl() - see here for an example and please try render the website to ensure the lifecycle:superseded badge renders properly.