fix: flaky test 'Import NFT should continue to display an imported NFT after importing, adding a new account, and switching back

[seaona]

Description

In this test, we are importing an NFT and right after, we try to switch accounts. Sometimes, when we try to click into the Account, we get an error that another element is obscuring it.
To fix it, when we click confirm, for importing the NFT, we'll wait until the element disappears, after proceeding to clicking the Account.

ElementClickInterceptedError: Element <button class="mm-box mm-text mm-button-base mm-button-base--size-sm mm-button-base--ellipsis multichain-account-picker mm-text--body-md-medium mm-text--ellipsis mm-box--padding-0 mm-box--padding-right-2 mm-box--padding-left-2 mm-box--display-inline-flex mm-box--gap-2 mm-box--justify-content-center mm-box--align-items-center mm-box--color-text-default mm-box--background-color-transparent mm-box--rounded-lg"> is not clickable at point (576,112) because another element <div class="mm-box mm-box--display-flex mm-box--justify-content-space-between mm-box--align-items-flex-end"> obscures it

Related issues

Fixes: #27005

Manual testing steps

1. Check ci

Screenshots/Recordings

See how the NFT modal is the element obscuring the Account menu, with the selector <div class="mm-box mm-box--display-flex mm-box--justify-content-space-between mm-box--align-items-flex-end">

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[metamaskbot]

Builds ready [10b6305]

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• builds (test): chrome, firefox
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• build viz: Build System
• mv3: Background Module Init Stats
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• bundle viz:

  • background: 0, 1, 2, 3, 4, 5
  • common: 0, 1, 10, 11, 2, 3, 4, 5, 6, 7, 8, 9
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  • ui: 0, 1, 10, 11, 2, 3, 4, 5, 6, 7, 8, 9

Page Load Metrics (1674 ± 85 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	214	2288	1488	531	255
		domContentLoaded	1502	2279	1663	176	85
		load	1511	2291	1674	177	85
		domInteractive	13	79	32	17	8

Bundle size diffs

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