Various fixes for Android EVM networks feature

[SergeyZhukovsky]

Resolves brave/brave-browser#20968
Resolves brave/brave-browser#20962
Resolves brave/brave-browser#20967
Resolves brave/brave-browser#20977

Submitter Checklist:

• I confirm that no security/privacy review is needed, or that I have requested one
• There is a ticket for my issue
• Used Github auto-closing keywords in the PR description above
• Wrote a good PR/commit description
• Squashed any review feedback or "fixup" commits before merge, so that history is a record of what happened in the repo, not your PR
• Added appropriate labels (QA/Yes or QA/No; release-notes/include or release-notes/exclude; OS/...) to the associated issue
• Checked the PR locally: npm run test -- brave_browser_tests, npm run test -- brave_unit_tests, npm run lint, npm run gn_check, npm run tslint
• Ran git rebase master (if needed)

Reviewer Checklist:

• A security review is not needed, or a link to one is included in the PR description
• New files have MPL-2.0 license header
• Adequate test coverage exists to prevent regressions
• Major classes, functions and non-trivial code blocks are well-commented
• Changes in component dependencies are properly reflected in gn
• Code follows the style guide
• Test plan is specified in PR before merging

After-merge Checklist:

• The associated issue milestone is set to the smallest version that the
  changes has landed on
• All relevant documentation has been updated, for instance:
  • https://github.com/brave/brave-browser/wiki/Deviations-from-Chromium-(features-we-disable-or-remove)
  • https://github.com/brave/brave-browser/wiki/Proxy-redirected-URLs
  • https://github.com/brave/brave-browser/wiki/Fingerprinting-Protections
  • https://github.com/brave/brave-browser/wiki/Brave%E2%80%99s-Use-of-Referral-Codes
  • https://github.com/brave/brave-browser/wiki/Custom-Headers
  • https://github.com/brave/brave-browser/wiki/Web-Compatibility-Exceptions-in-Brave
  • https://github.com/brave/brave-browser/wiki/QA-Guide
  • https://github.com/brave/brave-browser/wiki/P3A

Test Plan:

[Pavneet-Sing]

++

[Pavneet-Sing]

nit: maybe protected can be removed, unless we wanna inherit from RowViewHolder.

[wchen342]

LGTM:+1:

[srirambv]

Verification passed on Oppo Reno 5 with Android 12 running 1.37.42 x64 Nightly build

Verified brave/brave-browser#20968

• Verified URL's is replaced with URL
  

Verified brave/brave-browser#20977

• Verified when Buy & Swap screens are opened, custom networks are not listed
• Logged Hide all unsupported test networks along with custom networks for Swap screens brave-browser#21039

20977.mp4

Verified brave/brave-browser#20967

• Verified when a custom network is set as active, editing the chain ID doesn't remove it
• Encountered #21046 & #21047

20967.mp4

[Uni-verse]

brave/brave-browser#20962 has been verified

Completed using Nightly 1.37.42, Chromium 98.0.4758.87
Device: Samsung GS 21 | Android 12

• Button text has enough padding around it.