chore: adding storybook story for snap install warning component

[georgewrmarshall]

Description

This PR adds a Storybook story for the SnapInstallWarning component, improving coverage and making it easier to view and develop in isolation.

Related issues

Fixes: N/A

Manual testing steps

1. Go to the latest build of storybook in this PR
2. Navigate to Components/App/Snaps/SnapInstallWarning
3. Click "Open Warning Modal"
4. Verify that the SnapInstallWarning renders

Screenshots/Recordings

Before

N/A - New component stories

After

after720.mov

Known issue with the local provider in storybook

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 through Storybook stories
• I've documented my code using TypeScript types and story documentation
• I've applied the right labels on the PR

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 [5836390]

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

Page Load Metrics (1690 ± 68 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	263	1982	1630	341	164
		domContentLoaded	1462	1972	1667	136	65
		load	1470	1983	1690	141	68
		domInteractive	23	113	37	24	12
		backgroundConnect	8	78	28	22	11
		firstReactRender	15	96	38	26	12
		getState	4	51	14	14	7
		initialActions	0	1	0	0	0
		loadScripts	1002	1486	1195	119	57
		setupStore	7	62	20	20	9
		uiStartup	1648	2337	1945	173	83

Bundle size diffs

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