fix: Check validity per strategy

[karelianpie]

Description

We were marking all strategy descriptions as invalid if some were invalid. We should instead check per strategy if they have a valid description.

Related Issue

Fixes https://github.com/yearn/ySync/issues/117

Motivation and Context

Show the correct status for strategy descriptions

How Has This Been Tested?

Ran locally, screenshot below

Screenshots (if appropriate):

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Name	Status	Preview	Updated (UTC)
ysync	✅ Ready (Inspect)	Visit Preview	Aug 15, 2023 7:32am