Added input attribute for delete payment token mutation

[VinothKumar361]

Purpose of this pull request

This pull request (PR) adds the input attribute and update the non nullable attributes value in deletePaymentToken Mutation.There is no input attributes mentioned in docs but it actually require
public_hash input. The non nullable objects which mentioned in (https://github.com/magento/devdocs/blob/master/src/guides/v2.3/graphql/queries/index.md -The exclamation point indicates the value is non-nullable) is also not updated

Affected DevDocs pages

• https://devdocs.magento.com/guides/v2.3/graphql/mutations/delete-payment-token.html

Links to Magento source code

• https://github.com/magento/magento2/blob/cac512ffe55578d41c33146c6fe03ef6bdf851ee/app/code/Magento/VaultGraphQl/etc/schema.graphqls#L5
  https://github.com/magento/magento2/blob/cac512ffe55578d41c33146c6fe03ef6bdf851ee/app/code/Magento/VaultGraphQl/etc/schema.graphqls#L22
  https://github.com/magento/magento2/blob/cac512ffe55578d41c33146c6fe03ef6bdf851ee/app/code/Magento/VaultGraphQl/etc/schema.graphqls#L23
  https://github.com/magento/magento2/blob/cac512ffe55578d41c33146c6fe03ef6bdf851ee/app/code/Magento/VaultGraphQl/etc/schema.graphqls#L24
  https://github.com/magento/magento2/blob/cac512ffe55578d41c33146c6fe03ef6bdf851ee/app/code/Magento/VaultGraphQl/etc/schema.graphqls#L9

[devops-devdocs]

An admin must run tests on this PR before it can be merged.

[keharper]

running tests

[ghost]

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