UX: Updated Custom network displayed for selectable in network selection

[NidhiKJha]

This PR is to make sure if two networks with same id but different rpcUrl are there, list should show both of them

Related issues

Fixes: #22559

Manual testing steps

1. Have ganache running locally with npx ganache-cli --fork https://mainnet.infura.io/v3/[YOUROWNINFURAID] --chainId 1
2. Add it as a custom network with chainId=1
3. Select the newly added network
4. Change to another network
5. Note that you are able to change back to see the custom network in the list and able to switch back.

Screenshots/Recordings

Before

After

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Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
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[codecov]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (722d8fe) 68.13% compared to head (c580da4) 68.12%.
Report is 29 commits behind head on develop.

Files	Patch %	Lines
.../multichain/network-list-menu/network-list-menu.js	8.33%	11 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #22693      +/-   ##
===========================================
- Coverage    68.13%   68.12%   -0.00%     
===========================================
  Files         1087     1087              
  Lines        42665    42681      +16     
  Branches     11349    11354       +5     
===========================================
+ Hits         29066    29075       +9     
- Misses       13599    13606       +7     

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[metamaskbot]

Builds ready [c580da4]

• builds: chrome, firefox
• builds (beta): chrome
• builds (flask): chrome, firefox
• builds (MMI): chrome, firefox
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
• build viz: Build System
• mv3: Background Module Init Stats
• mv3: UI Init Stats
• mv3: Module Load Stats
• mv3: Bundle Size Stats
• mv2: E2e Actions Stats
• code coverage: Report
• storybook: Storybook
• typescript migration: Dashboard
• all artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4
  • common: 0, 1, 2, 3, 4, 5, 6, 7
  • content-script: 0
  • contentscript: contentscript
  • disable-console: disable-console
  • inpage: inpage
  • policy-load: policy-load
  • sentry-install: sentry-install
  • ui: 0, 1, 10, 11, 2, 3, 4, 5, 6, 7, 8, 9

Page Load Metrics (869 ± 60 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	90	192	120	28	14
		domContentLoaded	10	56	21	13	6
		load	737	1192	869	126	60
		domInteractive	10	56	21	13	6

Bundle size diffs [🚨 Warning! Bundle size has increased!]

• background: 176 Bytes (0.01%)
• ui: 177 Bytes (0.00%)
• common: 18 Bytes (0.00%)

[darkwing]

Works wonderfully. We should move some code to selectors but can be done in a follow up!