chore: Update Network Settings Actionable Buttons to use DS buttons

[brianacnguyen]

Description

• Update Network Settings Actionable Buttons to use DS buttons

Related issues

Fixes: #8336

Manual testing steps

1. Go to Settings
2. Click on Network
3. Click on Add Network
4. Click on Custom

Screenshots/Recordings

Before

After

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.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (64b7cb5) 39.83% compared to head (a2750f0) 40.20%.
Report is 23 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8287      +/-   ##
==========================================
+ Coverage   39.83%   40.20%   +0.37%     
==========================================
  Files        1233     1235       +2     
  Lines       29821    29926     +105     
  Branches     2840     2872      +32     
==========================================
+ Hits        11880    12033     +153     
+ Misses      17252    17200      -52     
- Partials      689      693       +4     

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[sonarcloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[georgewrmarshall]

LGTM!