ci: limit playwright install to chromium browser only

[davidmurdoch]

Description

Storybook CI jobs are failing due to the playwright install step timing out due to an AWS issue. We may be able to work around this issue by reducing the number of browsers we download. We only use chromium, so this PR limits it to just chromium

[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.

[Gudahtt]

LGTM!

[metamaskbot]

Builds ready [79c0d2d]

• 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 (2102 ± 94 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	414	2674	2015	415	199
		domContentLoaded	1824	2647	2066	191	91
		load	1836	2682	2102	196	94
		domInteractive	18	152	49	29	14
		backgroundConnect	9	80	35	24	11
		firstReactRender	56	296	111	53	26
		getState	44	204	91	38	18
		initialActions	0	1	0	0	0
		loadScripts	1327	2060	1553	169	81
		setupStore	6	86	18	21	10
		uiStartup	2150	3066	2452	224	108

Bundle size diffs

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