Add pending state in the UI for Uphold

[NejcZdovc]

We should be adding pending state into wallet button so user can disconnect from there if they are stuck

[LaurenWags]

Marking as QA/Blocked as this needs a new 1.12.x build to test

[btlechowski]

Verification passed on

Brave	1.12.107 Chromium: 84.0.4147.105 (Official Build) (64-bit)
Revision	a6b12dfad6663f13a7e16e9a42a6a4975374096b-refs/branch-heads/4147@{#943}
OS	Ubuntu 18.04 LTS

Verified test plan from brave/brave-core#6140

• Verified pending popup on brave://rewards
  

• Verified pending popup on Rewards Panel
  

Also verified in Polish locale. Pending is not translated. Logged #11100

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Verification passed on

Brave | 1.12.107 Chromium: 84.0.4147.105 (Official Build) (64-bit)
-- | --
Revision | a6b12dfad6663f13a7e16e9a42a6a4975374096b-refs/branch-heads/4147@{#943}
OS | Windows 10 OS Version 1903 (Build 18362.959)

• Verified test plan from Adds pending status for uphold brave-core#6140

• Confirmed that the Pending popup is shown when clicking on "Verify Wallet"
  

• Brave rewards settings page
  

• Confirmed if you then go add personal information as required for Uphold (name, phone number etc) but do not verify your email, you will still get the Pending popup when clicking on "Verify Wallet":
  

• Brave rewards settings page
  

• Confirmed if you then verify your email as required, you will now get the "Connected" popup:
  
  

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Verified passed with

Brave | 1.12.108 Chromium: 84.0.4147.105 (Official Build) (64-bit)
-- | --
Revision | a6b12dfad6663f13a7e16e9a42a6a4975374096b-refs/branch-heads/4147@{#943}
OS | macOS Version 10.14.6 (Build 18G3020)

Verified brave/brave-core#6140 (comment)

• Confirmed if you follow test plan from Do not create card if pending status brave-core#6252, you will get the Pending popup when clicking on "Verify Wallet":

• Confirmed if you then go add personal information as required for Uphold (name, phone number etc) but do not verify your email, you will still get the Pending popup when clicking on "Verify Wallet":

• Confirmed if you then verify your email as required, you will now get the "Connected" popup: