test: Remove obsolete permitted chains feature flag tests

[jiexi]

Description

Removes tests that are no longer applicable pertaining to permitted chains.

Related issues

See: #27847 (comment)

Manual testing steps

1. Go to this page...

Screenshots/Recordings

Before

After

Pre-merge author checklist

• I've followed MetaMask Contributor Docs and MetaMask Extension Coding Standards.
• I've completed the PR template to the best of my ability
• 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.

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.

[adonesky1]

LGTM

[Gudahtt]

LGTM!

To other reviewers, I'd strongly recommend using the "Hide whitespace" option on the diff view

[metamaskbot]

Builds ready [d0de645]

• builds: chrome, firefox
• builds (flask): chrome, firefox
• builds (MMI): chrome
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
• build viz: Build System
• mv3: Bundle Size Stats
• mv2: E2e Actions Stats
• storybook: Storybook
• typescript migration: Dashboard
• all artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4, 5, 6, 7
  • common: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12
  • ui: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13
  • content-script: 0
  • offscreen: 0

Page Load Metrics (1712 ± 57 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	1542	1970	1710	119	57
		domContentLoaded	1533	1958	1686	121	58
		load	1544	1971	1712	119	57
		domInteractive	24	164	45	36	17
		backgroundConnect	13	59	29	16	8
		firstReactRender	15	77	44	25	12
		getState	6	49	15	13	6
		initialActions	0	1	0	0	0
		loadScripts	1113	1490	1274	103	49
		setupStore	6	71	13	15	7
		uiStartup	1729	2303	1953	152	73

[Gudahtt]

Kicked out of merge queue due to known flaky CI failure (#29482). I have re-added it.