chore: MMI adds fallback property (#23540)

## **Description**

Reference
[PR](466e7ec)

Cherry picks a commit needed for MMI.
We need to add the `service` key value as a fallback for when the
custodian doesn't send an `environment` property.

## **Related issues**

Fixes:

## **Manual testing steps**

1. Go to this page... 2.
3.

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## **Pre-merge author checklist**

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## **Pre-merge reviewer checklist**

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## **Related issues**

Fixes:

## **Manual testing steps**

1. Go to this page...
2.
3.

## **Screenshots/Recordings**

<!-- If applicable, add screenshots and/or recordings to visualize the
before and after of your change. -->

### **Before**

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### **After**

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## **Pre-merge author checklist**

- [ ] I’ve followed [MetaMask Coding
Standards](https://github.com/MetaMask/metamask-extension/blob/develop/.github/guidelines/CODING_GUIDELINES.md).
- [ ] I've clearly explained what problem this PR is solving and how it
is solved.
- [ ] I've linked related issues
- [ ] I've included manual testing steps
- [ ] I've included screenshots/recordings if applicable
- [ ] 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-extension/blob/develop/.github/guidelines/LABELING_GUIDELINES.md)).
Not required for external contributors.
- [ ] I’ve properly set the pull request status:
  - [ ] In case it's not yet "ready for review", I've set it to "draft".
- [ ] In case it's "ready for review", I've changed it from "draft" to
"non-draft".

## **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.

ui/pages/institutional/confirm-add-custodian-token/confirm-add-custodian-token.js

@@ -125,8 +125,10 @@ const ConfirmAddCustodianToken = () => {
   const custodianLabel =
     connectRequest.labels?.find((label) => label.key === 'service')?.value ||
     t('custodian');
+
+  // Some custodians dont sent the "environment" inthe connect request
   const custodian = findCustodianByEnvName(
-    connectRequest.environment,
+    connectRequest.environment || custodianLabel,
     custodians,
   );