Refactoring multichain sidemenu to a selector component

[jaegerfe]

Fixes #706

Fixes #705

Description

Improving the UX of multi chain functionality by moving it from the side menu to a menu button and included a tag on the chain logo to indicate when the User is under a testnet environment.

Also, fixed a bug regarding authentication where the system was keeping the account connected when changing the network.

Test scenarios

• Selected a testnet chain and checked if the testnet tag appears.
• Changed from one chain to another and checked if the environment changes.

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have cleaned up the code in the areas my change touches
• My changes generate no new warnings
• I have checked my code and corrected any misspellings
• I have removed any unnecessary console messages

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[karynemayer]

Could we include changing the url according to the selected chain?
This would enable link sharing to the precise transaction/account in the specific chain

for example, for telos we should add ?network=telos, based on the chain name we have on index.ts for each chain

[jaegerfe]

Could we include changing the url according to the selected chain? This would enable link sharing to the precise transaction/account in the specific chain

for example, for telos we should add ?network=telos, based on the chain name we have on index.ts for each chain

I will do it in a different PR, opened #709 to keep track on this. This one will only change the side menu for the dropdown and update the ENV var name for it. Also, fixed some bugs on authentication regarding when change from one chain to another.