Revert "Added initial version of amp-anlaytics variable filters."

[avimehta]

Reverts #5621

Found a bug in the change. We use object.hasOwnProperty on objects created using map()

[jridgewell]

It'd be better to use:

// module level hoist
const hasOwn = Object.prototype.hasOwnProperty;

// wherever we need to check
if (hasOwn.call(object, property)) {
}

[avimehta]

Added #6552 as an alternative. Since the release will be getting cut shortly, I am okay with either of the PRs getting merged.