stats and referrals call ProfileManager::GetPrimaryUserProfile without waiting for profile initialization to complete

[bridiver]

Early initialization of the profiles could cause a wide range of problems and it's not clear what issues it may or may not be causing now, but it's clearly a problem that needs to be addressed

QA should check regular and referral pings for correctness

[LaurenWags]

Verified passed with

Brave | 1.21.77 Chromium: 89.0.4389.90 (Official Build) (x86_64)
-- | --
Revision | 62eb262cdaae9ef819aadd778193781455ec7a49-refs/branch-heads/4389@{#1534}
OS | macOS Version 10.15.7 (Build 19H524)

As per #14594 (comment), basically ensured that usage & referral pings are still working as per the following:

Usage pings

initial launch	30 days after install	Ads enabled

Referral pings

initial launch	24hrs after install	30 days after install	90 days after install

Note - I do not see the "30 days complete event" like @kjozwiak did in brave/brave-core#8196 (comment), however this is also the case in 1.21.76 so no difference there.

---

Verification passed on

Brave	1.21.77 Chromium: 89.0.4389.90 (Official Build) (64-bit)
Revision	62eb262cdaae9ef819aadd778193781455ec7a49-refs/branch-heads/4389@{#1534}
OS	Ubuntu 18.04 LTS

As per #14594 (comment), basically ensured that usage & referral pings are still working as per the following:

Usage pings

initial launch	30 days after install	Ads enabled

No ref codes on Linux

---

Verification passed on

Brave | 1.21.77 Chromium: 89.0.4389.90 (Official Build) (64-bit)
-- | --
Revision | 62eb262cdaae9ef819aadd778193781455ec7a49-refs/branch-heads/4389@{#1534}
OS | Windows 10 OS Version 2004 (Build 19041.867)

As per #14594 (comment), basically ensured that usage & referral pings are still working as per the following:

Usage pings

initial launch	30 days after install	Ads enabled

Referral pings

initial launch	24hrs after install	30 days after install	90 days after install

[srirambv]

Verification passed on OnePlus 6T with Android 10 running 1.21.77 x64 build

• Verified usage pings are still working as expected

Initial Launch	30 Days after install	Ads enabled

Verification passed on Samsung Samsung Galaxy Tab S5e with Android 9 running 1.21.77 x64 build

• Verified usage pings are still working as expected

Initial Launch	30 Days after install	Ads enabled