Strip Salesforce Marketing Cloud email tracker

[fmarier]

It looks like Salesforce Marketing Cloud is the product responsible for adding et_cid and et_rid to URLs, but I also found the occasional et_lid parameter in the wild:

• https://twitter.com/benefitbeauty?et_cid=6317785&et_rid=1148477691&linkid=twitter&et_lid=-Subscribers+with+opens+or+clicks+in+last+90+days
• https://foxinsight.michaeljfox.org/?utm_source=PFS&utm_medium=email&utm_campaign=MJFF_PFS_email_October&utm_content=PFS_email&et_cid=1163230&et_rid=225063475&et_lid=Take+Partem_cid=
• https://www.benefitcosmetics.com/us/en/product/gimme-brow-plus?utm_source=exacttarget&cID=&utm_medium=email&utm_campaign=20180529_FreeShipNoMinLastDay_&et_cid=6351880&et_rid=1148477691&linkid=https%3A%2F%2Fwww.benefitcosmetics.com%2Fus%2Fen%2Fproduct%2Fgimme-brow-plus%3Futm_source%3Dexacttarget%26cID%3D%%cid%%%26utm_medium%3Demail%26utm_campaign%3D20180529_FreeShipNoMinLastDay_&et_lid=--Unique+Opens+in+180+Days+(6+mo)
• https://www.danville-delegance.org/page/11/?et_cid=1399263&et_rid=241530505&et_lid=http%3A%2F%2Fwww.danville-delegance.org%2F&em_cid&et_blog
• http://www.mesem24.de/product/12995/Frostw%C3%A4chter%20Mini%20340.html?et_cid=10&et_lid=67077
• http://www.bitdefender.com/media/html/happy-weekend/?et_cid=21124155
• http://www.rdmag.com/article/2017/02/chan-zuckerberg-biohub-selects-researchers-receive-50-million-fight-disease?et_cid=5825577&et_rid=461755519&type=cta&et_cid=5825577&et_rid=461755519&linkid=content
• https://www.caesars.com/myrewards/profile/signin/?et_cid=1135579&et_rid=194864272&utm_source=et&utm_medium=email&utm_campaign=COR_PROFILE_UPDATE&dtm_em=9c5ff369537ca5a86c0577a8695329dd

This page shows that et_cid is a campaign ID and this one suggests that et_rid is related to an individual email subscriber.

We should therefore strip et_rid by default.

[stephendonner]

Verified PASSED using

Brave | 1.67.49 Chromium: 124.0.6367.91 (Official Build) nightly (64-bit)
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Revision | f288c3d5f0d3fa6f1bd10fe42174554bfe0275cc
OS | Windows 10 Version 22H2 (Build 19045.4355)

Steps:

1. installed 1.67.49
2. launched Brave
3. ensured Standard set for Trackers & ad blocking in brave://settings/shields
4. loaded https://brave.com/?et_cid=1234&et_rid=abcd
5. examined the URL bar

Confirmed et_cid=1234 remained in the URL bar, and et_rid=abcd was stripped out

[hffvld]

Verified on Pixel 7 using version(s):

Device/OS: Pixel 7 / panther_beta-user 14 AP31.240426.022 release-keys
Brave build: 1.67.100
Chromium: 125.0.6422.112 (Official Build) beta (64-bit) 

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STEPS:

1. Install and launch Brave
2. Open Settings > Brave Shields & privacy
3. Block trackers & ads > Confirm it set to Standard
4. Close the settings
5. Go to https://brave.com/?et_cid=1234&et_rid=abcd > Verify

ACTUAL RESULTS:

• Verified that et_rid parameter is removed, but et_cid is still present when Block trackers & ads is set to Standard

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