Validate account name and keypairs that are under 5 characters

[benjthayer]

New validation states have been added to the various flows listed below to prevent the user from entering an account or keypair name that is <5 characters. This change was requested originally by @saledjenic and has been completed as part of a sweep of backlog items.

Flows where this validation is now featured:

1. Editing an existing account

Figma:
https://www.figma.com/file/FkFClTCYKf83RJWoifWgoX/Wallet-v2?type=design&node-id=21039-220481&mode=design&t=2O68lxNGG9g1b1tx-4

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2. Rename keypair (Wallet Settings)

Figma:
https://www.figma.com/file/idUoxN7OIW2Jpp3PMJ1Rl8/%E2%9A%99%EF%B8%8F-Settings-%7C-Desktop?type=design&node-id=23264-284147&mode=design&t=i8YMYAMFRqAFgJ3v-4

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3. Add new keypair via seed phrase

Figma:
https://www.figma.com/file/FkFClTCYKf83RJWoifWgoX/Wallet-v2?type=design&node-id=21240-102220&mode=design&t=2O68lxNGG9g1b1tx-4

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4. Add new account via private key

Figma:
https://www.figma.com/file/FkFClTCYKf83RJWoifWgoX/Wallet-v2?type=design&node-id=21240-102386&mode=design&t=2O68lxNGG9g1b1tx-4

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5. Generate new keypair - naming the new keypair
   (Validation same as others and not shown again in design as would be duplicative)

[lukaszso]

I've edited our existing test cases to include the minimum character limits:

1. Editing an existing account
2. Rename keypair (Wallet Settings)
3. Add new keypair via seed phrase
4. Add new account via private key
5. Generate new keypair - naming the new keypair

And here is a completed test run for this ticket: TestRail