Disable #power-bookmarks-side-panel

[rebron]

Description

Disable #power-bookmarks-side-panel with Chromium 119 update for now. This flag is still available but flag is no longer visible via brave://flags

Related flag is currently disabled: brave://flags/#power-bookmark-backend and also needs to be evaluated if this needs to be enabled as part of power-bookmarks-side-panel in the future.

We do want to switch to the power bookmarks side panel but need to understand dependency with the related flag and other feedback and improvements on the Chromium side as it's a more complex UX (power bookmarks UX was not adopted by Edge).

Actual result:

Brave	1.61.48 Chromium: 119.0.6045.33 (Official Build) nightly (arm64)
Revision	50bf5d1
OS	macOS Version 14.1 (Build 23B73)
JavaScript	V8 11.9.169.4
User Agent	Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36

Expected result:

Reproduces how often:

Easily.

Brave version (brave://version info)

Version/Channel Information:

• Can you reproduce this issue with the current release? n/a
• Can you reproduce this issue with the beta channel? n/a
• Can you reproduce this issue with the nightly channel? yes with CR 119

Other Additional Information:

• Does the issue resolve itself when disabling Brave Shields? n/a
• Does the issue resolve itself when disabling Brave Rewards? n/a
• Is the issue reproducible on the latest version of Chrome? yes. Their new bookmarks side panel.

Miscellaneous Information:

[kjozwiak]

The above requires 1.60.105 or higher for 1.60.x verification 👍

[GeetaSarvadnya]

Verification PASSED on

Brave | 1.60.105 Chromium: 119.0.6045.59 (Official Build) (64-bit)
-- | --
Revision | a39727aa81373a09a915478fcb35826242c37335
OS | Windows 10 Version 22H2 (Build 19045.3570)

Before disabling #power-bookmarks-side-panel 1.61.50

Example	Example	Example

After disabling #power-bookmarks-side-panel 1.60.105

Example	Example	Example