Disabling the Moonpay/Bitcoin.com widget [1.18]

[ryanml]

Fixes: brave/brave-browser#12699
Uplifts: #7145

Approved, please ensure that before merging:

• You have checked CI and the builds, lint, and tests all pass or are not related to your PR.
• You have tested your change on Nightly.
• The PR milestones match the branch they are landing to.

After you merge:

• The associated issue milestone is set to the smallest version that the changes is landed on.

[kjozwiak]

test-browser failed on Win x64 as per https://ci.brave.com/job/pr-brave-browser-remove-bdc-1.18-windows/1/execution/node/247/log/. Created brave/brave-browser#12704. However, test-browser failures don't block uplifts.

[  FAILED  ] RewardsBrowserTest.UpholdLimitNoBAT, where TypeParam =  and GetParam() =  (23110 ms)

Restarting macOS as there was a bunch of test-browser failures as per https://ci.brave.com/job/pr-brave-browser-remove-bdc-1.18-macos/1/execution/node/251/log/.

Restarting Linux as there was a bunch of test-browser failures as per https://ci.brave.com/job/pr-brave-browser-remove-bdc-1.18-linux/1/execution/node/251/log/.

[kjozwiak]

test-browser failed on macOS as per https://ci.brave.com/job/pr-brave-browser-remove-bdc-1.18-macos/3/execution/node/251/log/

19:50:53  3 tests failed:
19:50:53      RewardsBrowserTest.UpholdLimitNoBAT (../../brave/components/brave_rewards/browser/test/rewards_browsertest.cc:399)
19:50:53      RewardsContributionBrowserTest.TipConnectedPublisherVerified (../../brave/components/brave_rewards/browser/test/rewards_contribution_browsertest.cc:587)
19:50:53      RewardsPromotionBrowserTest.PromotionRemovedFromEndpoint (../../brave/components/brave_rewards/browser/test/rewards_promotion_browsertest.cc:232)
19:50:53  2 tests crashed:
19:50:53      BraveContentBrowserClientTest.RewriteChromeSync (../../brave/browser/brave_content_browser_client_browsertest.cc:215)
19:50:53      RewardsBrowserTest.ToggleAutoContribute (../../brave/components/brave_rewards/browser/test/rewards_browsertest.cc:132)

test-browser failed on Linux due to BraveContentBrowserClientTest.RewriteChromeSync crashing as per https://ci.brave.com/job/pr-brave-browser-remove-bdc-1.18-linux/3/execution/node/251/log/.

18:56:39  1 test crashed:
18:56:39      BraveContentBrowserClientTest.RewriteChromeSync (../../brave/browser/brave_content_browser_client_browsertest.cc:215)

Looks like Win x64 had some issues starting due to AWS. Restarting.

Created brave/brave-browser#12753 for the BraveContentBrowserClientTest.RewriteChromeSync issue but the rest appear to be rewards related which isn't related to this PR.

[kjozwiak]

test-browser failed on Win x64 due to BraveContentBrowserClientTest.RewriteChromeSync crashing as per https://ci.brave.com/job/pr-brave-browser-remove-bdc-1.18-windows/7/execution/node/247/log/.

22:41:06  1 test crashed:
22:41:06      BraveContentBrowserClientTest.RewriteChromeSync (../../brave/browser/brave_content_browser_client_browsertest.cc:215)

Created brave/brave-browser#12753 for the BraveContentBrowserClientTest.RewriteChromeSync issue but the rest appear to be rewards related which isn't related to this PR.

[kjozwiak]

Uplift into 1.18.x approved after deliberating with @brave/uplift-approvers. QA has verified the PR on Nightly via #7145 (comment).