eCCT: Differentiate between OTR and Incognito in Profile and Tab code

This change deprecates the use of isIncognito in Profile and Tab
related classes and instead introduces isOffTheRecord, which is true
for all OTR profiles, and isIncognitoBranded, which is only true for
Incognito profiles (currently only main OTR profile and iCCTs).

In follow up CLs, we will audit every isOffTheRecord & isIncognito call in Clank and change it to the appropriate method.

Bug: 335609494
Change-Id: I66b480bd24df545ee3ab197f0510ea9055a9af7e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5644997
Reviewed-by: Theresa Sullivan <twellington@chromium.org>
Commit-Queue: Zaina Al-Mashni <zalmashni@google.com>
Code-Coverage: findit-for-me@appspot.gserviceaccount.com <findit-for-me@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1318093}