Enable Shred on iOS all channels

[StephenHeaps]

Fixes #1260

Enabled for Chromium 130.* which released with v1.71 on iOS to not enable for existing releases which included some Shred code behind the feature flag(s).

[github-actions]

✅ Test Seed Generated Successfully

To apply the test seed:

1. Desktop: Launch the browser with --variations-pr=1261.
   Android: Set the command line to --variations-pr=1261 in debug menu, restart the browser.
   iOS: Set Variations PR to 1261 in Brave Core Switches debug menu, restart the browser.
2. Wait 5-10 seconds to fetch the seed.
3. Restart the browser to apply the seed.
4. Ensure Active Variations section at brave://version starts with the expected seed version (see below).

Seed Details

Parameter	Value
Version	pull/1261@6b71c09eab99c95d635c07a36da4f2b91daf7434
Uploaded	Tue, 12 Nov 2024 21:57:41 GMT
PR commit	0124217
Base commit	06b678a
Merge commit	6b71c09
Serial number	776e7e3779c70e81fcfa7d75276a8bc3

[kjozwiak]

iOS verification(s):

Release - BraveShredFeatureStudy:Enabled (Mobile/Phone)

Verification PASSED on iPhone 11 running iOS 18.1 using the following build(s):

Brave | 1.71.125 Chromium: 130.0.6723.116 (Official Build) stable (64-bit) 
--- | ---
Revision | 192628478ccb...
OS | iOS

• launched 1.71.118 Chromium: 130.0.6723.70
• set Variations PR to 1261 via BraveCore Switches under the QA Developer Options
• once Variations PR has been set, restarted 1.71.118 Chromium: 130.0.6723.70
• restarted 1.71.118 Chromium: 130.0.6723.70 once more
• ensured that pull/1261@6b71c09eab99c95d635c07a36da4f2b91daf7434 via brave://version under Active variations
• ensured that BraveShredFeatureStudy:Enabled via brave://version
• ensured that the Shred feature is enabled/visible via the shields panel
• ensured that the Shred feature is enabled/visible long tapping the tabs icon

Example	Example	Example	Example	Example	Example	Example

Release - BraveShredFeatureStudy:Enabled (Tablet)

Verification PASSED on iPad Air (3rd Gen) running iOS 18.1 using the following build(s):

Brave | 1.71.125 Chromium: 130.0.6723.116 (Official Build) stable (64-bit) 
--- | ---
Revision | 192628478ccb...
OS | iOS

• launched 1.71.118 Chromium: 130.0.6723.70
• set Variations PR to 1261 via BraveCore Switches under the QA Developer Options
• once Variations PR has been set, restarted 1.71.118 Chromium: 130.0.6723.70
• restarted 1.71.118 Chromium: 130.0.6723.70 once more
• ensured that pull/1261@6b71c09eab99c95d635c07a36da4f2b91daf7434 via brave://version under Active variations
• ensured that BraveShredFeatureStudy:Enabled via brave://version
• ensured that the Shred feature is enabled/visible via the shields panel
• ensured that the Shred feature is enabled/visible long tapping the tabs icon

Example	Example	Example	Example	Example	Example	Example

Release - BraveShredFeatureStudy not used - C130 min_version not met (Mobile/Phone)

Verification PASSED on iPhone 11 running iOS 18.1 using the following build(s):

Brave | 1.70.133 Chromium: 129.0.6668.100 (Official Build) stable (64-bit) 
--- | ---
Revision | 53596529e7d7...
OS | iOS

• launched 1.71.118 Chromium: 130.0.6723.70
• set Variations PR to 1261 via BraveCore Switches under the QA Developer Options
• once Variations PR has been set, restarted 1.71.118 Chromium: 130.0.6723.70
• restarted 1.71.118 Chromium: 130.0.6723.70 once more
• ensured that pull/1261@6b71c09eab99c95d635c07a36da4f2b91daf7434 via brave://version under Active variations
• ensured that BraveShredFeatureStudy is not being listed/used under brave://version
• ensured that the Shred feature is NOT visible via the shields panel
• ensured that the Shred feature is NOT long tapping the tabs icon

Example	Example	Example	Example	Example

[kjozwiak]

Uplift into production/main approved after deliberating with @brave/uplift-approvers.