fix: unit flaky test AddContact component › should disable submit button when input is not a valid address

[seaona]

Description

The unit test for Add Account is flaky as sometimes the state[name].stage var is undefined so it breaks at this point:

The fix is to add this variable in the test setup, so it's always defined.

Related issues

Fixes: #27624

Manual testing steps

1. Go to this page...

Screenshots/Recordings

Before

After

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• I’ve included tests 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]

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[metamaskbot]

Builds ready [f762a80]

• 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
  • common: 0, 1, 10, 11, 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 (2190 ± 167 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	236	3104	2086	548	263
		domContentLoaded	1700	3056	2140	334	160
		load	1712	3142	2190	348	167
		domInteractive	17	123	55	29	14
		backgroundConnect	9	167	50	44	21
		firstReactRender	55	198	111	33	16
		getState	5	228	38	54	26
		initialActions	0	1	0	0	0
		loadScripts	1235	2260	1578	263	126
		setupStore	12	123	47	32	15
		uiStartup	1932	3885	2497	477	229

Bundle size diffs

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

[metamaskbot]

Builds ready [7012156]

• 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
  • common: 0, 1, 10, 11, 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 (1956 ± 64 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	1769	2253	1961	137	66
		domContentLoaded	1745	2151	1919	117	56
		load	1773	2250	1956	133	64
		domInteractive	16	82	51	19	9
		backgroundConnect	12	98	41	24	11
		firstReactRender	49	295	101	52	25
		getState	5	93	21	24	11
		initialActions	0	1	0	0	0
		loadScripts	1278	1626	1426	109	52
		setupStore	13	99	33	25	12
		uiStartup	1960	2977	2196	223	107

Bundle size diffs

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