chore: remove max send amount hook and fees reducer (#5853)

### Description

This PR removes the estimated max amount in the FiatExchangeAmount
component, and sets the max amount to the user's token balance. The max
amount estimation only worked for Celo and was inaccurate. Removing this
also allowed removing:
- some unused hooks
- the whole `fees` redux store

The only user flow impacted by this change is the withdraw flow on Celo
(since there was effectively no fee estimation for other networks before
anyway), specifically when a user tries to cash out without leaving
enough balance to pay for gas - most likely when they only have 1 type
of token. For a user in this flow, they will reach the end of the
withdraw flow and not be able to proceed. I'll add an error state
separately.

### Test plan

n/a

### Related issues

- Related to RET-1183

### Backwards compatibility

Y

### Network scalability

If a new NetworkId and/or Network are added in the future, the changes
in this PR will:

- [ ] Continue to work without code changes, OR trigger a compilation
error (guaranteeing we find it when a new network is added)

package.json

@@ -200,7 +200,6 @@
     "svgs": "^4.2.0",
     "tslib": "^2.6.3",
     "typed-redux-saga": "^1.5.0",
-    "utf8": "^3.0.0",
     "uuid": "^9.0.1",
     "victory-native": "^36.9.2",
     "viem": "^2.9.28",
@@ -237,7 +236,6 @@
     "@types/redux-mock-store": "^1.0.6",
     "@types/seedrandom": "^3.0.5",
     "@types/shelljs": "^0.8.11",
-    "@types/utf8": "^2.1.6",
     "@types/uuid": "^9.0.0",
     "@types/yargs": "^17.0.32",
     "@typescript-eslint/eslint-plugin": "^5.58.0",

src/app/ErrorMessages.ts

@@ -18,7 +18,6 @@ export enum ErrorMessages {
   QR_FAILED_INVALID_ADDRESS = 'qrFailedInvalidAddress',
   QR_FAILED_INVALID_RECIPIENT = 'qrFailedInvalidRecipient',
   CONTRACT_KIT_INIT_FAILED = 'contractKitInitFailed',
-  CALCULATE_FEE_FAILED = 'calculateFeeFailed',
   ADDRESS_VALIDATION_ERROR = 'addressValidationError',
   ADDRESS_VALIDATION_NO_MATCH = 'addressValidationNoMatch',
   ADDRESS_VALIDATION_FULL_POORLY_FORMATTED = 'addressValidationFullPoorlyFormatted',