add: a/b tested promotion of hiding spam tokens

[schmanu]

What it solves

• Adds a onboarding Tooltip to the new "hide token" button which will only be shown until dismissed.
• the tooltip will only be shown to 50% of users to a/b test their efficiency.

How to test it

1. Open the assets of a Safe
2. If the tooltip is not shown, delete the SAFE_v2__AB_hide_token_promo entry in your local storage.
   2.1. Dismiss it => it should not come up again until the local storage is cleared

Analytics changes

None

Screenshots

[github-actions]

Branch preview

✅ Deploy successful!

https://hide_token_onboarding_tooltip--webcore.review-web-core.5afe.dev

[github-actions]

ESLint Summary View Full Report

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Type	Occurrences	Fixable
Errors	0	0
Warnings	0	0
Ignored	0	N/A

• Result: ✅ success
• Annotations: 0 total

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^{Report generated by eslint-plus-action}

[usame-algan]

Looks good! Only thing I noticed is that the button text in dark mode is a bit hard to read on the white background. cc @liliiaorlenko

[katspaugh]

Tested, works well ✅

[usame-algan]

🚀