Remove query trackers from Hive email newsletters

[fmarier]

https://www.hive.co/ is an email marketing platform that appears to insert unique h_sid and h_slt query parameters.

Sample unsubscribe link: https://app.hive.co/email/elt/?h_sid=3d...22d0&hash=20...2&next=https%3A%2F%2Fapp.hive.co%2Femail%2Funsubscribe%2Ftour%2F%3Ftour_id%3D130179%26user_id%3D33...9%26hash%3Db72...d6%26utm_source%3Dhive%26utm_medium%3Demail%26utm_campaign%3Dhive_email_id_196293_pizza-city-fest

I confirmed that neither h_sid nor h_slt are necessary for unsubscribing from a list.

Also this contains a sample link that can be debounced: https://app.hive.co/email/elt/?h_sid=3d...22d0&hash=20..2&next=https%3A//www.hive.co/%3Ftid%3Dfteremail%26utm_source%3Dhive%26utm_medium%3Demail%26utm_campaign%3Dhive_email_id_196293_pizza-city-fest

[fmarier]

I couldn't find any documentation about what the parameters represent in their documentation. However, it seems likely that h_sid stands for subscribed ID, likely a unique ID for a user.

The h_slt param is base64-encoded and contains the following JSON information:

{"hash":"7026...78b","hive_user_id":33...89}

and so it contains a unique user ID that we should remove.

[fmarier]

Unfortunately, we can't strip them out of all URLs because it breaks these two types of pages:

• https://app.hive.co/email/28077/view/public?h_sid=1271475706-5aba9932b99a399aeb76f234&hash=a5a07febf520004
• https://app.hive.co/email//elt/?h_sid=48e61db721-599f6907b822446c56ff58e4&hash=7c241dd75c08b18&next=https%3A%2F%2Fwww.complex.com%2Fpop-culture%2F2018%2F06%2Fjohnny-knoxville-gets-smoked-by-spicy-wings-hot-ones

Therefore we'll have to exempt the app.hive.co domain from this filtering.

[LaurenWags]

Verified with

Brave | 1.57.10 Chromium: 115.0.5790.75 (Official Build) beta (x86_64)
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Revision | 6fbe50fcb5cd24cd6bd0fe48aee3a108eb21441e
OS | macOS Version 13.4.1 (a) (Build 22F770820b)

Verified test plan from brave/brave-core#18723 (comment).

Step 1	Step 2	Step 3	Step 4

[hffvld]

Verified on Pixel 7 using version(s):

Device/OS: Pixel 7 [panther_beta-user 14 UPB4.230623.007 release-keys]
Brave build: 1.57.33
Chromium: 115.0.5790.114 (Official Build) beta (64-bit) 
Revision: 86b4ea1d70ce73c4468d84cc8277f1f9de14b8bc

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STEPS:
Followed the steps from this test plan

ACTUAL RESULTS:

• Verified that the URL in the URL bar is just https://brave.com/ when opening https://brave.com/?h_sid=1234&h_slt=eyJoYXNoIjogImFiY2QxMjM0IiwgInVzZXItaWQiOiAxMjM0NTZ9
• Verified that the email is displayed when opening https://app.hive.co/email/28077/view/public?h_sid=1271475706-5aba9932b99a399aeb76f234&hash=a5a07febf520004 (Broken images are expected, but the text should be there and we shouldn't get an HTTP 403 error).

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