feat(#1646): Implement UI hiding for secret variables

[sanjai0py]

Description

https://github.com/usebruno/bruno/assets/84461672/3f64feec-b25c-4636-91d2-e5a9edbc7567

https://github.com/usebruno/bruno/assets/84461672/454361e4-f879-4374-81aa-af8bad001d74

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closes #330 too

[helloanoop]

@sanjai0py I think there is an issue when you have multiple rows with secrets, toggling one secret would toggle all secrets.

Can you get this fixed?

[dw-0]

So what about this? https://github.com/usebruno/bruno/pull/650