Remove request body details from Rewards verbose logging

[zenparsing]

Some URL requests that are made in bat-native-ledger should not have their request body logged at the verbose logging level, and should be logged instead at a higher level. Audit the code for URL request body logging and increase the logging level as necessary.

[kjozwiak]

@brave/legacy_qa we won't be able to verify the above on Android until we get #15924 fixed and uplifted into 1.25.x.

[LaurenWags]

Removing QA/Blocked, this should be available to test on https://github.com/brave/brave-browser/releases/tag/v1.25.64

[stephendonner]

Verified PASSED using brave/brave-core#8767 with build

Brave	1.25.64 Chromium: 90.0.4430.212 (Official Build) beta (x86_64)
Revision	e3cd97fc771b893b7fd1879196d1215b622c2bed-refs/branch-heads/4430@{#1429}
OS	macOS Version 11.3.1 (Build 20E241)

Steps:

1. new profile, launched Brave using --enable-logging=stderr --vmodule="*/bat-native-ledger/*"=6,"*/brave_rewards/*"=6,"*/bat-native-ads/*"=6,"*/bat-native-confirmations/*"=6,"*/brave_ads/*"=9,"*/brave_user_model/*"=6 --brave-ads-staging --brave-ads-debug --rewards=staging=true,reconcile-interval=5
2. enabled Enabled Rewards Verbose Logging via brave://flags
3. went to brave://rewards and clicked on Verify Wallet
4. authorized Uphold
5. logged in to Uphold
6. went to brave://rewards-internals and clicked Refresh to populate logs
7. searched for both oauth and token just to be sure
8. confirmed neither were present, together - just tokens for the grant process
9. downloaded the logs via the Download button and repeated steps 6 & 7

example	example	example

---

Verification passed on

Brave | 1.25.64 Chromium: 90.0.4430.212 (Official Build) beta (64-bit)
-- | --
Revision | e3cd97fc771b893b7fd1879196d1215b622c2bed-refs/branch-heads/4430@{#1429}
OS | Windows 10 OS Version 2004 (Build 19041.985)

• Verified the test plan from Do not log request details for rewards external wallet session endpoints brave-core#8767

ensured that clicking on Refresh correctly populates the empty text field with the log
ensured that clicking on Download log correctly initiates the download process/flow
ensured that *.uphold.com/oauth2/token didn't appear anywhere within the log after connecting to an Uphold account
also searched for oauth2 & oauth2/token within the log as a double check

Example	Example	Example

---

Verification passed on

Brave	1.25.65 Chromium: 91.0.4472.57 (Official Build) (64-bit)
Revision	e3443317fa07f1e9997e4a9c738eddfefc3c0292-refs/branch-heads/4472_54@{#6}
OS	Ubuntu 18.04 LTS

• Verified the test plan from Do not log request details for rewards external wallet session endpoints brave-core#8767

ensured that clicking on Refresh correctly populates the empty text field with the log
ensured that clicking on Download log correctly initiates the download process/flow
ensured that *.uphold.com/oauth2/token didn't appear anywhere within the log after connecting to an Uphold account
also searched for oauth2 & oauth2/token within the log as a double check

[srirambv]

Removing OS/Android label as there is a follow up issue logged for it #15924

[srirambv]

Verification passed on OnePlus 6T with Android 10 running 1.25.66 x64 build

• Verified the test plan from Do not log request details for rewards external wallet session endpoints brave-core#8767
• Verified clicking on Refresh correctly populates the empty text field with the log
• Verified clicking on Download log works fine and logs file is downloaded. Logged [Android] Download rewards log doesn't prompt for file saving #16061 as a follow up
• Verified *.uphold.com/oauth2/token dont appear anywhere within the log after connecting to an Uphold account
• Verified no entry for oauth2 & oauth2/token in the log file

---

Verification passed on Samsung Tab A with Android 10 running 1.25.66 x64 build

• Verified the test plan from Do not log request details for rewards external wallet session endpoints brave-core#8767
• Verified clicking on Refresh correctly populates the empty text field with the log
• Verified clicking on Download log works fine and logs file is downloaded. Logged [Android] Download rewards log doesn't prompt for file saving #16061 as a follow up
• Verified *.uphold.com/oauth2/token dont appear anywhere within the log after connecting to an Uphold account
• Verified no entry for oauth2 & oauth2/token in the log file