[Bug] Info Header Font Size Fix

[jpeng-ms]

Purpose

A11y wanted the info header to support large font size.

Does this introduce a breaking change?

[ ] Yes
[X] No

Pull Request Type

What kind of change does this Pull Request introduce?

[X] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

How to Test

1. open app in simulator
2. go to settings
3. go to accessibility
4. enable large font
5. go back to app, join a call

What to Check

1. text not getting cutoff
2. text does appear bigger when a11y is enabled

Other Information

before and after:

Scale down test

longest text in info header currently:

[Leah-Xia-Microsoft]

LGTM

[palatter]

Looks good