Part of #18714: Replacing deprecated constants with enums

[Jainex17]

Explanation

This PR is a part of Replace deprecated constants with enums #18714

Changes Made

• ui/pages/confirmation/components/confirmation-network-switch/confirmation-network-switch.js
• ui/pages/swaps/list-with-search/list-with-search.js
• ui/pages/confirmation/templates/add-ethereum-chain.js

Screenshots/Screencaps

Before

ConfirmationNetworkSwitch

After

ConfirmationNetworkSwitch

Cant found other two components in storybook

Here is path of both

• ui/pages/swaps/list-with-search/list-with-search.js
• ui/pages/confirmation/templates/add-ethereum-chain.js

Manual Testing Steps

• Pull this branch
• Run yarn storybook
• Check stories for ConfirmationNetworkSwitch

Pre-merge author checklist

• I've clearly explained:
  • What problem this PR is solving
  • How this problem was solved
  • How reviewers can test my changes
• Sufficient automated test coverage has been added

Pre-merge reviewer checklist

• Manual testing (e.g. pull and build branch, run in browser, test code being changed)
• PR is linked to the appropriate GitHub issue
• IF this PR fixes a bug in the release milestone, add this PR to the release milestone

[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]

Codecov Report

Merging #19860 (b048c2f) into develop (6bb5e69) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop   #19860      +/-   ##
===========================================
- Coverage    69.70%   69.70%   -0.01%     
===========================================
  Files          982      982              
  Lines        37071    37071              
  Branches      9944     9944              
===========================================
- Hits         25840    25838       -2     
- Misses       11231    11233       +2     

Impacted Files	Coverage Δ
...tion-network-switch/confirmation-network-switch.js	77.78% <ø> (ø)
...pages/confirmation/templates/add-ethereum-chain.js	54.24% <ø> (ø)
...i/pages/swaps/list-with-search/list-with-search.js	36.36% <ø> (ø)

... and 2 files with indirect coverage changes

[Jainex17]

Hello @georgewrmarshall Could you please review my pull request?

Thank you!

[georgewrmarshall]

LGTM! Thanks for your contribution @Jainex17