Mem perf recipe csv validators

[jkschneider]

What's changed?

In RecipeMarketplaceContentValidator.java, the helper methods validateDisplayName and validateDescription were incorrectly taking the accumulated validation as a parameter:

// BEFORE (buggy)
validation = validation.and(validateDisplayName(validation, displayName, value));
                    ^^^^^^^^^^
                    passed in and chained inside

Inside validateDisplayName, it chained errors onto the passed-in validation, then returned it. The caller then chained again with .and(result), creating a tree structure like:

Both(validation, Both(validation, Invalid))

Each iteration roughly doubled the tree size → O(2^N) memory with N recipes.