test: Collect coverage from Snaps components

[FrederikBolding]

Description

A faulty regex caused us to not correctly collect coverage from Snaps components and systems. This PR corrects that regex by adding an end matcher.

[metamaskbot]

Builds ready [f381f7c]

• 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 (1941 ± 100 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	1631	2591	1945	211	101
		domContentLoaded	1620	2500	1908	198	95
		load	1630	2544	1941	208	100
		domInteractive	27	123	59	32	15
		backgroundConnect	11	91	35	26	12
		firstReactRender	18	101	53	27	13
		getState	5	96	30	29	14
		initialActions	0	0	0	0	0
		loadScripts	1170	1903	1408	172	82
		setupStore	6	93	20	23	11
		uiStartup	1812	3300	2290	331	159

Bundle size diffs

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