fix: use PORTFOLIO_VIEW flag to determine chain polling

[bergeron]

Description

Updates the token price and detection hooks to only poll across chains when PORTFOLIO_VIEW is set.

Related issues

Manual testing steps

1. With PORTFOLIO_VIEW=1, requests should go to the price api across all chains.
2. Without PORTFOLIO_VIEW=1, requests should go to the price api on the current chain.

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
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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).
• 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.

[metamaskbot]

Builds ready [9b99609]

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

Page Load Metrics (1892 ± 72 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	1726	2419	1914	175	84
		domContentLoaded	1704	2159	1860	132	63
		load	1718	2266	1892	151	72
		domInteractive	26	266	51	50	24
		backgroundConnect	10	159	40	36	17
		firstReactRender	49	289	121	69	33
		getState	41	202	116	48	23
		initialActions	0	1	0	0	0
		loadScripts	1251	1635	1390	109	52
		setupStore	6	81	14	18	9
		uiStartup	1987	2810	2309	236	113

Bundle size diffs

• background: 0 Bytes (0.00%)
• ui: 50 Bytes (0.00%)
• common: 0 Bytes (0.00%)

[bergeron]

I might have to fix a test since #28556 was introduced

[metamaskbot]

Builds ready [a60bb7d]

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

Page Load Metrics (2050 ± 124 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	303	2751	1806	660	317
		domContentLoaded	1623	2683	2011	245	118
		load	1632	2728	2050	258	124
		domInteractive	26	187	66	42	20
		backgroundConnect	8	95	37	27	13
		firstReactRender	62	207	97	38	18
		getState	44	182	90	35	17
		initialActions	0	1	0	0	0
		loadScripts	1200	2029	1515	185	89
		setupStore	6	75	15	17	8
		uiStartup	2094	3214	2384	303	145

Bundle size diffs

• background: 0 Bytes (0.00%)
• ui: 50 Bytes (0.00%)
• common: 0 Bytes (0.00%)