Use error modals in Brave Rewards settings page instead of error notifications for linking-related errors (convert these notifications to error modals)

[Miyayes]

Description

Due to some Uphold-specific states, some additional errors/modals will need to be shown in the Uphold case in order to best resolve #16468 per Szilard's comment here: brave/brave-core#9212 (comment).

[Miyayes]

Increased priority to make sure error messages can be surfaced to users with the new Rewards panel 2.0 UI.

[szilardszaloki]

Showing modals on the Rewards page is not yet implemented on Android. Should we remove the OS/Android tag and create a separate issue for Android?
cc: @Miyayes @deeppandya

[deeppandya]

Showing modals on the Rewards page is not yet implemented on Android. Should we remove the OS/Android tag and create a separate issue for Android?
cc: @Miyayes @deeppandya

I would prefer to have a separate issue for Android.

[LaurenWags]

Per #16652 (comment), removed OS/Android label and logged #19246.

[LaurenWags]

Verified passed with

Brave	1.33.69 Chromium: 96.0.4664.35 (Official Build) nightly (x86_64)
Revision	8df3babf8da8faa8aacb78f4848ef66a93b4944b-refs/branch-heads/4664@{#680}
OS	macOS Version 11.6.1 (Build 20G224)

Uphold Notifications - PASSED

upholdBATNotAllowedModal-PASSED

Used Charles Proxy to simulate BAT not being available in my region.
Confirmed modal notification shown, not panel notification.
Confirmed "Learn More" linked to https://support.uphold.com/hc/en-us/articles/360033020351-Brave-BAT-and-US-availability as per PR.
Confirmed "Close" button closed the modal.

upholdBlockedUserModal-PASSED

Used Charles Proxy to simulate status = blocked.
Confirmed modal notification shown, not panel notification.
Confirmed "Learn More" linked to https://support.uphold.com/hc/en-us/articles/360045765351-Why-we-block-or-restrict-accounts-and-how-to-reduce-the-risk as per PR.
Confirmed "Close" button closed the modal.

upholdPendingUserModal-PASSED

Used Charles Proxy to simulate status = pending.
Confirmed modal notification shown, not panel notification.
Confirmed "Learn More" linked to https://support.uphold.com/hc/en-us/articles/206695986-How-do-I-sign-up-for-Uphold-Web- as per PR.
Confirmed "Close" button closed the modal.

upholdRestrictedUserModal-PASSED

Used Charles Proxy to simulate status = restricted.
Confirmed modal notification shown, not panel notification.
Confirmed "Learn More" linked to https://support.uphold.com/hc/en-us/articles/360045765351-Why-we-block-or-restrict-accounts-and-how-to-reduce-the-risk as per PR.
Confirmed "Close" button closed the modal.

kycRequiredModal-PASSED

Confirmed modal notification shown, not panel notification.
Confirmed no "Learn More" link.
Confirmed "Close" button closed the modal.

mismatchedProviderAccountsModal-PASSED

Confirmed modal notification shown, not panel notification.
Confirmed "Learn More" linked to https://support.brave.com/hc/en-us/articles/360034841711-What-is-a-verified-wallet- as per PR.
Confirmed "Close" button closed the modal.

Brave | 1.33.83 Chromium: 96.0.4664.45 (Official Build) beta (x86_64)
-- | --
Revision | 76e4c1bb2ab4671b8beba3444e61c0f17584b2fc-refs/branch-heads/4664@{#947}
OS | macOS Version 11.6.1 (Build 20G224)

bitFlyer Notifications - PASSED but follow up issue logged

kycRequiredModal-FAILED

Confirmed modal notification shown, not panel notification.
Confirmed no "Learn More" link.
Confirmed "Close" button closed the modal.
However, notification text does not match brave/brave-core#10469 (comment). It is the same as 1.32.x for this scenario. Logged follow up issue #19572 per discussion with @Miyayes.

mismatchedProviderAccountsModal-PASSED

Confirmed modal notification shown, not panel notification.
Confirmed "Learn More" linked to https://support.brave.com/hc/en-us/articles/360034841711-What-is-a-verified-wallet- as per PR.
Confirmed "Close" button closed the modal.

Gemini Notifications - PASSED

kycRequiredModal-PASSED

Confirmed modal notification shown, not panel notification.
Confirmed no "Learn More" link.
Confirmed "Close" button closed the modal.

mismatchedProviderAccountsModal-PASSED

Confirmed modal notification shown, not panel notification.
Confirmed "Learn More" linked to https://support.brave.com/hc/en-us/articles/360034841711-What-is-a-verified-wallet- as per PR.
Confirmed "Close" button closed the modal.

Brave | 1.33.85 Chromium: 96.0.4664.45 (Official Build) beta (x86_64)
-- | --
Revision | 76e4c1bb2ab4671b8beba3444e61c0f17584b2fc-refs/branch-heads/4664@{#947}
OS | macOS Version 11.6.1 (Build 20G224)

Uphold deviceLimitReachedModal-PASSED

Confirmed modal notification shown, not panel notification.
Confirmed "Learn More" linked to https://support.brave.com/hc/en-us/articles/360056508071 as per PR.
Confirmed "Close" button closed the modal.

bitFlyer deviceLimitReachedModal-PASSED

Confirmed modal notification shown, not panel notification.
Confirmed "Learn More" linked to https://support.brave.com/hc/en-us/articles/360056508071 as per PR.
Confirmed "Close" button closed the modal.

Gemini deviceLimitReachedModal-PASSED

Confirmed modal notification shown, not panel notification.
Confirmed "Learn More" linked to https://support.brave.com/hc/en-us/articles/360056508071 as per PR.
Confirmed "Close" button closed the modal.