[Android] Resolve billing client issues

[deeppandya]

Description

With new gmail account, we are getting the error shown below in the screenshot,

Steps to reproduce

1. Create a new gmail account
2. Try to purchase the subscription through IAP

Actual result

Expected result

No error

Reproduces how often

Easily reproduced

Brave version

1.68.x and newer

Device

• Brand/model: n/a
• Android version: n/a

Channel information

• release (stable)
• beta
• nightly

Reproducibility

• with Brave Shields disabled
• with Brave Rewards disabled
• in the latest version of Chrome

Miscellaneous information

For QA: billing library was affected, so we should double check nothing regressed in this regard (like subscribing to VPN, Leo and so on).

• create a brand new GPS account/get the email account added to the internal test and verify that purchase VPN works
• install Brave on a previous GPS account that already had a subscription in the past and make sure that's working
• upgrade from the previous version where you already have a subscription and ensure your subscription still works

[kjozwiak]

Verification PASSED on Pixel 6 Pro running Android 15 using the following build(s):

Brave | 1.68.133 Chromium: 127.0.6533.73 (Official Build) (64-bit)
--- | ---
Revision | 4b666a378f83d73216bfe91260f1d335d4787b38
OS | Android 15; Build/AP31.240617.009; 35; REL

Test Case #1 - New GPS Account (has never subscribed to premium)

• created a brand new Google account and @deeppandya added it into the GPS internal beta channel
• verified that the new account had access to 1.68.133 Chromium: 127.0.6533.73 via the internal test channel
• downloaded/launched 1.68.133 Chromium: 127.0.6533.73
• tapped on the Hamburger Menu -> VPN -> 7 Day Free Trial
• ensured that the purchase card was being displayed without any issues
• ensured that you can run through the Billing API and subscribe/enable VPN

Example	Example	Example	Example	Example	Example	Example

Test Case #2 - Using previous/older account (has subscribed to Premium before)

• download/installed 1.68.128 Chromium 127.0.6533.73 which @deeppandya provided
  • Quick Note: this APK was signed with a different key to allow IAP using an APK
• upgraded from 1.68.128 Chromium 127.0.6533.73 --> 1.68.133 Chromium: 127.0.6533.73 via the internal test channel
• tapped on the Hamburger Menu -> VPN -> 7 Day Free Trial
• ensured that the purchase card was being displayed without any issues

[hffvld]

Verified on Pixel 6 using version(s):

Device/OS: Pixel 6 / oriole-user 14 AP2A.240605.024 release-keys
Brave build: 1.68.133
Chromium: 127.0.6533.73 (Official Build) (64-bit)

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New Google account

STEPS:

1. Create a brand new @gmail.com account > Sign in with that account on a test device
2. Install Brave 1.68.133 from Play Store
3. Launch Brave > Attempt to purchase VPN or Leo subscription
4. Finish purchase flow > Verify

ACTUAL RESULTS:

• Verified that a brand new account can purchase VPN and Leo subscriptions from Play Store
• Verified

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Account which already subscribed in the past

STEPS:

1. Install Brave 1.68.128 from Play Store
2. Launch Brave > Attempt to purchase Leo or VPN subscription > Confirm the error
3. Install Brave 1.68.133
4. Launch Brave > Attempt to purchase Leo or VPN subscription > Confirm there is no error

ACTUAL RESULTS:

• Verified that accounts that made a purchase in the past are still able to purchase VPN and Leo subscriptions from the Play Store
• Verified that it says You're not eligible for the free trial

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