Update offers to the new path

[alikhleel]

• moving from old path of firestore '/offers' to new path 'soters/{store_id}/offers'
• enhance the code and clean it

[github-actions[bot]]

Visit the preview URL for this PR (updated for commit 8746955):

https://myrewards-e3b0c--pr32-offers-path-xp26jntn.web.app

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