🚧 Add new variants and variant entity pages

[evans-g-crsj]

https://d3b.atlassian.net/browse/SKFP-754?atlOrigin=eyJpIjoiYTE0YjIyNDczMThiNDA5MjhiZGFhOWZjZDQyNzdiMjIiLCJwIjoiaiJ9

• use /variants2 to access variants v2 page
• new code is appended with V2

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[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟢	Statements	100%	0/0
🟢	Branches	100%	0/0
🟢	Functions	100%	0/0
🟢	Lines	100%	0/0

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