Add pixel measurements for New Tab Page

[dus7]

Task/Issue URL: https://app.asana.com/0/72649045549333/1207542256913463/f
Tech Design URL:
CC:

Description:

Adds pixels based on https://app.asana.com/0/72649045549333/1207539163549342/f.

Steps to test this PR:

1. Enable New Tab Page Sections in Debug menu.
2. Enable Intro Message in Debug menu.
3. Verify pixels are fired for:
4. Showing NTP, daily and regular.
5. Intro message displayed.
6. Intro message dismissed.
7. Tapping on favorites placeholder.
8. Showing favorites tooltip.
9. Expand and collapse favorites.
10. Using each shortcut.
11. Opening NTP settings.
12. Rearranging sections.
13. Toggling sections visibility.
14. Toggling shortcuts visibility.

Definition of Done (Internal Only):

• Does this PR satisfy our Definition of Done?

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Internal references:

Software Engineering Expectations
Technical Design Template

[github-actions]

	Warnings
⚠️	PR has more than 500 lines of code changing. Consider splitting into smaller PRs if possible.

Generated by 🚫 dangerJS against df78012

[github-actions]

This PR has been inactive for more than 7 days and will be automatically closed 7 days from now.

[brindy]

LGTM except for this icon:

Feel free to merge if you wanna fix here or it's already fixed somewhere else.