Only store info for relevant standalone plugins in the transient cache

[mukeshpanchal27]

Follow-up on #1562

The current API query https://api.wordpress.org/plugins/info/1.2/?action=query_plugins&request[author]=wordpressdotorg&request[tag]=performance&request[per_page]=100 is returning some unrelated plugins like Plugin Check (PCP) and SQLite Database Integration. In the future, if anyone else uses Performance as a tag, it will also be added to our transient. However, we only need the standalone plugins defined in perflab_get_standalone_plugin_data().

I’ve also moved the array definition for $fields after the cache check, as it's redundant in the cached version.

[github-actions]

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Co-authored-by: mukeshpanchal27 <[email protected]>
Co-authored-by: swissspidy <[email protected]>
Co-authored-by: adamsilverstein <[email protected]>
Co-authored-by: felixarntz <[email protected]>

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[adamsilverstein]

Nice!

[felixarntz]

@mukeshpanchal27 Great catch!

PR looks good, though one recommendation to improve performance.