fix: prevent calling wallet_addEthereumChain only on persistent chains (MetaMask#18958)

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## **Description**

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`wallet_addEthereumChain` was throwing when trying to add any "default
chains", in the sense of chains that are present by default when
installing MetaMask Mobile. These default chains, like Base, can however
be removed by users, so `wallet_addEthereumChain` shouldn't throw.

~This PR updates `wallet_addEthereumChain` to fail only for chains that
can't be removed by users, like Ethereum Mainnet, Linea Mainnet and
default testnets.~

This PR removes the out of date conditional where
`wallet_addEthereumChain` can't be called with some chainIds. This API
can be called with any `chainId` and will prompt the user to update the
default `rpcUrl` for an enabled networks (including "default networks")

## **Changelog**

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CHANGELOG entry: `wallet_addEthereumChain` no longer throws an error
when called with "default network" chainIds. This API can be called with
any `chainId` and will prompt the user to update the default `rpcUrl`
for an enabled networks (including "default networks").

## **Related issues**

Fixes:
[WAPI-408](https://consensyssoftware.atlassian.net/browse/WAPI-408)

## **Manual testing steps**

```gherkin
Feature: Add default chain

  Scenario: user tries to add a default chain previously removed
    Given a default chain (i.g. Base Mainnet) isn't part of the user's known networks

    When user visit an app that tries to switch to Base Mainnet
    Then it should correctly prompt to add Base Mainnet network
```

## **Screenshots/Recordings**

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### **Before**

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### **After**

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## **Pre-merge author checklist**

- [ ] I’ve followed [MetaMask Contributor
Docs](https://github.com/MetaMask/contributor-docs) and [MetaMask Mobile
Coding
Standards](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/CODING_GUIDELINES.md).
- [ ] I've completed the PR template to the best of my ability
- [ ] I’ve included tests if applicable
- [ ] I’ve documented my code using [JSDoc](https://jsdoc.app/) format
if applicable
- [ ] I’ve applied the right labels on the PR (see [labeling
guidelines](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/LABELING_GUIDELINES.md)).
Not required for external contributors.

## **Pre-merge reviewer checklist**

- [ ] I've manually tested the PR (e.g. pull and build branch, run the
app, test code being changed).
- [ ] I confirm that this PR addresses all acceptance criteria described
in the ticket it closes and includes the necessary testing evidence such
as recordings and or screenshots.


[WAPI-408]:
https://consensyssoftware.atlassian.net/browse/WAPI-408?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ

---------

Co-authored-by: Alex Donesky <adonesky@gmail.com>

Author: baptiste-marchand

app/core/RPCMethods/wallet_addEthereumChain.js

@@ -112,11 +112,6 @@ export const wallet_addEthereumChain = async ({
     });
   };
 
-  //TODO: Remove aurora from default chains in @metamask/controller-utils
-  const actualChains = { ...ChainId, aurora: undefined };
-  if (Object.values(actualChains).find((value) => value === chainId)) {
-    throw rpcErrors.invalidParams(`May not specify default MetaMask chain.`);
-  }
   const networkConfigurations = selectEvmNetworkConfigurationsByChainId(
     store.getState(),
   );