(Fix) Duplicated Owner Addresses on Safe Creation

[fernandomg]

This PR closes #1661, by:

• adding a form-level validation function to properly check for duplicates
  

Also fixes #1183, by:

• fixing row deletion function
  

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[github-actions]

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Type	Occurrences	Fixable
Errors	0	0
Warnings	3	0
Ignored	1	N/A

• Result: ✅ success

• Annotations: 3 total

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[warning] @typescript-eslint/explicit-module-boundary-types

Require explicit return and argument types on exported functions' and classes' public class methods

• src/routes/open/components/SafeOwnersConfirmationsForm/index.tsx Line 279 - Missing return type on function.
• src/routes/open/components/SafeOwnersConfirmationsForm/index.tsx Line 279 - Argument 'controls' should be typed.
• src/routes/open/components/SafeOwnersConfirmationsForm/index.tsx Line 279 - Object pattern argument should be typed.

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^{Report generated by eslint-plus-action}

[ghost]

Travis automatic deployment:
https://pr1666--safereact.review.gnosisdev.com/rinkeby/app

[ghost]

Travis automatic deployment:
https://pr1666--safereact.review.gnosisdev.com/volta/app

[francovenica]

This one looks good

A new ticket was created for the same issue in Address book and Settings (Adding/replacing owners)

[fernandomg]

@Agupane, @nicosampler I just added a couple of tests for the 'remove-owner' related function.

I was thinking about splitting this into two separate PRs and add tests for the refactored function. But given it's already checked/tested, I did it here 😬

[nicosampler]

@Agupane, @nicosampler I just added a couple of tests for the 'remove-owner' related function.
LGTM

[francovenica]

I've never acknowledged that this ticket also fixes 1183.

[ghost]

Travis automatic deployment:
https://pr1666--safereact.review.gnosisdev.com/rinkeby/app

[ghost]

Travis automatic deployment:
https://pr1666--safereact.review.gnosisdev.com/volta/app

[ghost]

Travis automatic deployment:
https://pr1666--safereact.review.gnosisdev.com/rinkeby/app

[ghost]

Travis automatic deployment:
https://pr1666--safereact.review.gnosisdev.com/volta/app