fix: use updateProductVariantPrices mutation to save variant price

[trojanh]

Signed-off-by: trojanh rajan.tiwari@kiprosh.com

Resolves #170
Impact: breaking|major
Type: bugfix

Issue

Unable to set product variant price

1. Create a new variant.
2. Add a price to it
3. Refresh to see that the price is reset to zero.

Solution

Use updateProductVariantPrices mutation to set the price.

Breaking changes

none

Testing

1. Create a new variant.
2. Add a price to it
3. Refresh to see that the price is NOT reset to zero.
4. Also publish and refresh the variant to see it the changes get saved.

[spencern]

Thanks for the PR!

[willopez]

One small change necesary, otherwise looks good.

[manueldelreal]

Save for @willopez review comment and the linting errors on the checks this one does permit the price update via the admin ui.

[trojanh]

@willopez I have replaced all occurrences of Alerts.alert and Alert.toast to use snackbar. Also, fixed the linting error and rebased the branch. Please review the changes.

[willopez]

thanks @trojanh!