Remove Instagram's new igsh share tracker

[fmarier]

Similar to YouTube's sharing functionality which copies a URL along with a tracking parameter to the clipboard (#33037), Instagram adds an igsh parameter to the URLs that it copies to the clipboard in JS.

We should add it to our default filter and the copy clean link feature. Then, #33037 will end up sanitizing both YouTube and Instagram.

[fmarier]

More info on why they track outbound links like that: https://help.instagram.com/2599848706833869

(HT https://twitter.com/gateklons/status/1739407333602533461)

[fmarier]

Here are two examples (parameter value shortened for privacy):

• https://www.instagram.com/reel/C04bQYMRoQj/?utm_source=ig_web_button_share_sheet&igsh=ZDNl...IxNw==
• https://www.instagram.com/p/C1nNxSbsAzk/?utm_source=ig_web_button_share_sheet&igsh=ZDNl...IxNw==

where the identifier appears to be stabled across logins for a given user.

Note that the igsh param is only added via the Share to... option and not when selecting Copy link directly from the first menu. Share to... (first menu) followed by Copy link (second menu) does append the parameter.

[stephendonner]

Verified PASSED using

Brave | 1.63.101 Chromium: 120.0.6099.199 (Official Build) nightly (x86_64)
-- | --
Revision | 8d3f0a563e185b6a763cc8e210ab24775dfb9047
OS | macOS Version 14.3 (Build 23D5043d)

Case1 : https://www.youtube.com/watch?v=dQw4w9WgXcQ&si=YjziZuccJeIE-b6z - PASSED

Steps:

1. installed 1.63.101
2. launched Brave
3. opened Developer Tools -> Network
4. clicked on Preserve log
5. copied and pasted https://www.youtube.com/watch?v=dQw4w9WgXcQ&si=YjziZuccJeIE-b6z into the URL bar and hit return
6. looked at the network requests

Confirmed the 200 OK request dropped the &si= parameter

Case 2: https://youtu.be/watch?v=dQw4w9WgXcQ&si=YjziZuccJeIE-b6z - PASSED

1. installed 1.63.101
2. launched Brave
3. opened Developer Tools -> Network
4. clicked on Preserve log
5. copied and pasted https://youtu.be/watch?v=dQw4w9WgXcQ&si=YjziZuccJeIE-b6z into the URL bar and hit return
6. looked at the network requests

Confirmed the 200 OK request did NOT have the &si= parameter

Case 3: https://www.instagram.com/p/C1nNxSbsAzk/?utm_source=ig_web_button_share_sheet&igsh=ZDNl...IxNw== - PASSED

1. installed 1.63.101
2. launched Brave
3. opened Developer Tools -> Network
4. clicked on Preserve log
5. copied and pasted https://www.instagram.com/p/C1nNxSbsAzk/?utm_source=ig_web_button_share_sheet&igsh=ZDNl...IxNw== into the URL bar and hit return
6. looked at the network requests

Confirmed &igsh=ZDNl...IxNw== only shows up on the 200 Internal Redirect request, NOT on the 200 OK request

example	example	example

[hffvld]

Verified on Pixel 7 using version(s):

Device/OS: Pixel 7 / panther_beta-user 14 AP11.231215.009 release-keys
Brave build: 1.63.146
Chromium: 121.0.6167.139 (Official Build) beta (64-bit) 

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STEPS:

1. Install and launch Brave
2. Go to Instagram and log in to your test account
3. Tap the Three-dot button on any post > Share to > Copy link
4. Open NTP > Paste > Confirm that Igsh param is there
5. Tap Enter > Verify the URL when a page is loaded
6. Go to YT > Ope any video > Share > Copy URL
7. Open NTP > Paste > Confirm that the si param is there
8. Tap Enter > Verify the URL when a page is loaded

ACTUAL RESULTS:

• Verified that the igsh param is removed when copying Instagram links with Share to > Copy link
• Verified that the si param is removed when copying YouTube links

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