Feat(frontend/contract): editing an application before application period ends

[kittybest]

Description
base on this file: https://www.notion.so/pse-team/Multi-Round-support-Testing-127d57e8dd7e804ab960e50afd56da55?d=127d57e8dd7e80338fea001c24bc7ea3#127d57e8dd7e80f1abd8c73d06d6ee53

to allow user edit an application, I've tried directly upload the updated file to overlap the original file and take over the url, however, maybe because our website cached fetched metadata, the information is not updated.

So I suggest in two ways:

1. add a function in contract to update the metadataurl
2. clear the cache of the metadata information in the frontend