fix: don't re-fetch variables if their loading status is done #18651
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Connects #18296
Checks if variables have been loaded and skips the hydration process for any variables that have already been hydrated.
previously note the delay between double clicking the Submit/Cancel button and the cancel notification firing
now cancel button fires immediately*
* I know we're planning on changing it so it doesn't flash, but the flash is actually the indicator that the ui is responsive.