Strip Blackbaud email tracker

[fmarier]

The bbeml parameter seems to be related to the Blackbaud fundraising and CRM platform.

Unfortunately, I couldn't find it in their documentation. It does however have enough entropy to uniquely identify users, and it was unnecessary in all of the URLs I looked at. For example, this one:

• https://www.justgiving.com/campaign/elmiraeverlasting2024?bbeml=tp-TAjKPWPjVUW7fs8pf2h4qg.jLsUO8r9iFUS3Y7QezxHWsw

The unsubscribe link doesn't use this parameter and so it appears safe to remove.

I also appears on this list where it was added in this PR without any explanation.

[stephendonner]

Verification PASSED using

Brave | 1.67.73 Chromium: 125.0.6422.26 (Official Build) nightly (x86_64)
-- | --
Revision | 76e7d97680074902ad7bde84f0a1a6c392a4ca6a
OS | macOS Version 11.7.10 (Build 20G1427)

Steps:

1. installed 1.67.73
2. launched Brave
3. ensured adblocking is set to Standard mode (not aggressive)
4. opened https://brave.com/?bbeml=abcd&foo=bar
5. examined the URL bar and confirmed that the bbeml parameter was removed. The foo=bar parameter should still be there

[MadhaviSeelam]

Verification PASSED using

Brave | 1.67.85 Chromium: 125.0.6422.60 (Official Build) beta (64-bit)
-- | --
Revision | d01060f5ec155e6eb64a335203663a29c0e5d81f
OS | Windows 11 Version 23H2 (Build 22631.3593)

1. installed 1.67.85
2. launched Brave
3. ensured adblocking is set to Standard mode (not aggressive)
4. opened https://brave.com/?bbeml=abcd&foo=bar
5. examined the URL bar and confirmed that the bbeml parameter was removed. The foo=bar parameter should still be there

[hffvld]

Verified on Pixel 7 using version(s):

Device/OS: Pixel 7 / panther_beta-user 14 AP31.240426.022 release-keys
Brave build: 1.67.85 
Chromium: 125.0.6422.60 (Official Build) beta (64-bit) 

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STEPS:

1. Follow the steps from Strip Blackbaud email tracker brave-core#23358 (comment)
2. Verify

ACTUAL RESULTS:

• Verified that the bbeml parameter is removed.
• Verified that the foo=bar parameter is not removed.

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