fix: Send ETH using Deeplinks sets incorrect amount if is a thousand or higher

[blackdevelopa]

Description

This PR simplifies the numeric value parsed from the deeplink url, removing decimals and adjusting based on the exponent.

Related issues

Fixes: #7769

Manual testing steps

1. Go to https://metamask.github.io/metamask-deeplinks/#
2. Set a huge amount
3. Scan
4. See how the amount displayed on the confirm screen is same as what was set in the deeplink

Screenshots/Recordings

Before

send-deeplink-high.mp4

After

RPReplay_Final1701706536.MP4

Pre-merge author checklist

• I’ve followed MetaMask Coding Standards.
• 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 format if applicable
• I’ve applied the right labels on the PR (see labeling guidelines). 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.

[github-actions]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[github-actions]

E2E test started on Bitrise: https://app.bitrise.io/app/be69d4368ee7e86d/pipelines/2c885202-b37f-4770-8bd3-d4d760dbc783
You can also kick off another Bitrise E2E smoke test by removing and re-applying the (Run Smoke E2E) label

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (ca25073) 39.39% compared to head (7a1e436) 39.40%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
...core/DeeplinkManager/Handlers/handleEthereumUrl.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7998   +/-   ##
=======================================
  Coverage   39.39%   39.40%           
=======================================
  Files        1220     1221    +1     
  Lines       29800    29804    +4     
  Branches     2831     2831           
=======================================
+ Hits        11740    11743    +3     
- Misses      17371    17372    +1     
  Partials      689      689           

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[sonarcloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
75.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud