fix(3836): roles error message when creating should reflect the problem instead of a generic runtime error

[rowasc]

This pull request makes the following changes:

• Uses the update role rules + the create rules merged recursively so that it doesn't just override the name rules in one of them
• stops throwing a runtime exception for roles creation errors 🤷‍♂ 🤷‍♀

Test checklist:

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Fixes #3836 .

Ping @ushahidi/platform

[rowasc]

@Angamanga @tuxpiper I apparently forgot to ask for a code review here. If anyone has some bandwidth, check it out :D this basically makes it so that we don't throw runtime errors to users and fixes the create rules for roles which were just overriding the name validation 😬

[tuxpiper]

LGTM 👍