[Search aggregator] Remove URL and fix ranking for people suggestions

Currently, people suggestions show the destination URL as secondary
text. This change updates the secondary text to show "<name> People"
instead of the destination URL. Per omnibox standards, secondary text is
on the same line as the suggestion name. In realbox, the secondary text
is below the suggestion name.

This change also boosts the ranking of people suggestions to include
people suggestion email as a strong scoring field. Previously, the
email was included in the client-side generated destination URL.
However, since the server generated URL does not include email anymore,
this change fixes that ranking drop.

Before (unscoped): https://screenshot.googleplex.com/3oRdNRf7i7LPoby
After (unscoped): https://screenshot.googleplex.com/6yMzuoGbMqRfbrL

Before (scoped): https://screenshot.googleplex.com/8psjdSjjhxzGmc5
After (scoped): https://screenshot.googleplex.com/8tWyhtu2C969rn7

Before (realbox): https://screenshot.googleplex.com/7KSPj3f27qHuyxf
After (realbox): https://screenshot.googleplex.com/9eHE4NUBrfyNKmy

Bug: 421946451
Change-Id: I1e49e0234050fe9c89c7068ffee6cc851054d82e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6614397
Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Commit-Queue: Alex Chen <alexwchen@chromium.org>
Reviewed-by: manuk hovanesian <manukh@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1469342}