Filter out rb_clickid from URLs

[fmarier]

rb_clickid was added as a tracking parameter in jparise/chrome-utm-stripper#44, but it's very hard to find any information about it (note that we should leave linkid alone for webcompat reasons).

It's used all over the place on Russian sites, for example:

https://veryberrylab.ru/catalog/bukety-s-klubnikoy/?rb_clickid=86252549-1618003652-1663225310&size=1&price_from=3000&price_to=5000

A lot of Russian websites also exclude it in their robots.txt, for example https://esh-derevenskoe.ru/robots.txt.

The TopMailRu tracker does seem to use it, though their minified code is especially hard to decipher.

The only blog post I could find about it only mentions that it's often seen in combination with utm_source=mytarget though the example above shows that it's not always the case.

Based on its name and the fact that it's high-entropy, we should assume that this is tracking users as opposed to campaigns.

[stephendonner]

@fmarier mind providing a simplified testcase? (I just want to be sure we don't miss anything.) Thanks!

[stephendonner]

Verified PASSED using the testplan at brave/brave-core#9733 with build

Brave	1.30.27 Chromium: 92.0.4515.159 (Official Build) nightly (x86_64)
Revision	0185b8a19c88c5dfd3e6c0da6686d799e9bc3b52-refs/branch-heads/4515@{#2052}
OS	macOS Version 11.5.2 (Build 20G95)

Steps:

1. new profile
2. launch Brave
3. opened Developer Tools, clicked on the Network panel
4. loaded https://brave.com/?rb_clickid=1234567890abcdef
5. confirmed that the redirected page loaded doesn't contain the rb_clickid= parameter

[srirambv]

Verification passed on Oppo Reno 5 with Android 11 running 1.30.76 x64 build

• Verified test plan from brave/brave-core#9733

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Verification passed on Samsung Tab A with Android 11 running 1.30.76 x64 build

• Verified test plan from brave/brave-core#9733