Set WebUI-based Rewards panel flag to Enabled by default (1.43.x) Beta

[Miyayes]

Description

Same as #24062, except specify Beta, now that 1.43 is Beta.

Example PR: See here for the previous PR for 1.43.x Nightly: https://github.com/brave/brave-variations/pull/316/files

[diracdeltas]

does this warrant a sec review? i don't think we've looked at this at any point, but maybe there's no risks here. my main concern would be rule of 2 violations like the ones that used to exist in wallet webui: https://chromium.googlesource.com/chromium/src/+/master/docs/security/rule-of-2.md

[kjozwiak]

does this warrant a sec review? i don't think we've looked at this at any point, but maybe there's no risks here. my main concern would be rule of 2 violations like the ones that used to exist in wallet webui: https://chromium.googlesource.com/chromium/src/+/master/docs/security/rule-of-2.md

@diracdeltas this was already enabled on master using Griffen via brave/brave-variations#317 and QA'd via brave/brave-variations#316 (comment). The above is scheduled to be released via 1.43.x. We're planning on enabling the WebUI rewards panel on BETA using Griffin (same method as we did on master) so it can get some bake time on BETA before it's released via 1.43.x.

Should we wait till the above gets a security review? Or can we enable it on BETA so it can bake and only push to Production once the security team has done a review. Let me know if that works or if we should just wait before enabling on BETA.

[kjozwiak]

Quick update: As per the conversation via Slack, we'll be pushing the above into BETA via Girffin either today/tomorrow.

[bsclifton]

Unintentionally resolved with brave/brave-variations#326 (production)

I merged the change to staging with brave/brave-variations#328