Allow specific origin to direct to second page of token allowance flow

[danjm]

Explanation

Bridging functionality on the portfolio dapp is non-optimal because users are unknowingly customizing their token allowances to error prone amounts. This PR mitigates the problem by taking those users directly to second screen of the token allowance flow, thereby lowering the chance that they inadvertently customize the pDapps suggested allowance amount.

Screenshots/Screencaps

Peek.2023-03-31.00-35.mp4

Manual Testing Steps

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

If further QA is required (e.g. new feature, complex testing steps, large refactor), add the Extension QA Board label.

In this case, a QA Engineer approval will be be required.

[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.

My concerns are resolved but I shouldn't be the one to approve.

[metamaskbot]

Builds ready [0511fcd]

• builds: chrome, firefox
• builds (beta): chrome, firefox
• builds (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
  • 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 (1595 ± 62 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	94	130	107	11	5
		domContentLoaded	1437	1991	1577	130	63
		load	1437	1991	1595	130	62
		domInteractive	1437	1991	1577	130	63

Bundle size diffs

• background: 0 bytes
• ui: 112 bytes
• common: 0 bytes

[codecov]

Codecov Report

Merging #18395 (0511fcd) into develop (ed3cc40) will increase coverage by 0.00%.
The diff coverage is 85.71%.

@@           Coverage Diff            @@
##           develop   #18395   +/-   ##
========================================
  Coverage    64.69%   64.69%           
========================================
  Files          925      925           
  Lines        35584    35590    +6     
  Branches      9136     9138    +2     
========================================
+ Hits         23018    23023    +5     
- Misses       12566    12567    +1     

Impacted Files	Coverage Δ
ui/pages/token-allowance/token-allowance.js	64.23% <85.71%> (+0.87%)	⬆️

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[jpuri]

@danjm : the change looks good to me. I will create a followup ticket for confirmations team to add unit test cases for this.

[Gudahtt]

LGTM! But it we should add an e2e test case for this as well

[darkwing]

I looked for ways to spoof that hostname but none still work, so this seems reasonable.