chore: Remove Snaps insight dead code

[FrederikBolding]

Description

Removes dead Snaps code following the removal of the old confirmation screens.

Manual testing steps

N/A

[Mrtenz]

Nice!

[metamaskbot]

Builds ready [199a796]

• 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 (1681 ± 46 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	225	1968	1536	424	204
		domContentLoaded	1542	1907	1664	95	46
		load	1547	1920	1681	96	46
		domInteractive	24	105	43	27	13
		backgroundConnect	8	64	23	17	8
		firstReactRender	16	75	43	24	12
		getState	5	51	11	12	6
		initialActions	0	1	0	0	0
		loadScripts	1046	1392	1180	83	40
		setupStore	7	61	16	18	8
		uiStartup	1771	2191	1904	107	51

Bundle size diffs

• background: 0 Bytes (0.00%)
• ui: -1.03 KiB (-0.01%)
• common: 0 Bytes (0.00%)