Fix BrowsingMenu layout

[dus7]

Task/Issue URL: https://app.asana.com/0/414709148257752/1208946169184139/f
Tech Design URL:
CC:

Description:

Adjusts layout for BrowsingMenuButton so that it expands along with the label inside. Additionally BrowsingMenuViewController got a new constraint preventing the menu view from going outside view bounds.

Steps to test this PR:

1. Enable link conditioner with a bad/slow connection profile.
2. Try to load any site, stop before it finishes loading.
3. Open menu, check if button titles are visible.
4. Load site again (without link conditioner).
5. Check browsing menu sizing and layout is as expected.
6. Go to System Settings -> Developer -> View (simulator) or Display & Brightness -> Display Zoom (physical device) and set display zoom to "Larger text".
7. Repeat testing steps.

Definition of Done (Internal Only):

• Does this PR satisfy our Definition of Done?

Orientation Testing:

• Portrait
• Landscape

Device Testing:

• iPhone SE (1st Gen)
• iPhone 8
• iPhone X
• iPhone 14 Pro
• iPad

OS Testing:

• iOS 15
• iOS 16
• iOS 17

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Internal references:

Software Engineering Expectations
Technical Design Template

[Bunn]

LGTM