Fixes backup keys export/import; improves print flow

[NejcZdovc]

Resolves #13274
Resolves #7512
Resolves #7511
Resolves #11419

Submitter Checklist:

• Submitted a ticket for my issue if one did not already exist.
• Used Github auto-closing keywords in the commit message.
• Added/updated tests for this change (for new code or code which already has tests).
• Ran git rebase -i to squash commits (if needed).
• Tagged reviewers and labelled the pull request as needed.
• Request a security/privacy review as needed. (Ask a Brave employee to help if you cannot access this document.)

Test Plan:

Plan a (#13274)

1. Enable payments
2. Go to advance settings
3. Export backup keys

Plan b (#13274)

1. Enable payments
2. Go to advance settings
3. Import backup keys

Plan c (#7512)

1. Enable payments
2. Go to advance settings
3. Go to backup
4. Click print
5. Make sure that new tab is opened and print dialog is shown

Plan d (#7511)

1. Enable payments
2. Go to advance settings
3. Export backup keys
4. Make sure that new tab is not opened

Plan e (#11419)

1. Enable payments
2. Go to advance settings
3. Export backup keys
4. Go to brave profile folder and make sure that brave_wallet_recovery.txt is not there

Reviewer Checklist:

• Request a security/privacy review as needed if one was not already requested.

Tests

• Adequate test coverage exists to prevent regressions
• Tests should be independent and work correctly when run individually or as a suite ref
• New files have MPL2 license header

[codecov-io]

Codecov Report

Merging #13279 into master will increase coverage by <.01%.
The diff coverage is 18.6%.

@@            Coverage Diff             @@
##           master   #13279      +/-   ##
==========================================
+ Coverage   56.06%   56.07%   +<.01%     
==========================================
  Files         282      282              
  Lines       28060    28075      +15     
  Branches     4607     4611       +4     
==========================================
+ Hits        15732    15742      +10     
- Misses      12328    12333       +5

Flag	Coverage Δ
#unittest	56.07% <18.6%> (ø)	⬆️

Impacted Files	Coverage Δ
js/constants/messages.js	100% <ø> (ø)	⬆️
js/constants/appConstants.js	100% <ø> (ø)	⬆️
js/actions/appActions.js	18.69% <0%> (-0.11%)	⬇️
app/browser/tabs.js	23.78% <0%> (-0.12%)	⬇️
js/lib/appUrlUtil.js	86.53% <100%> (ø)	⬆️
app/browser/api/ledger.js	58.64% <12.5%> (-0.04%)	⬇️
app/browser/reducers/ledgerReducer.js	43.71% <75%> (-0.45%)	⬇️
...r/components/preferences/payment/ledgerRecovery.js	37.25% <0%> (-0.75%)	⬇️
... and 4 more

[srirambv]

@NejcZdovc for test plan C, should the backup codes be bold ?

[NejcZdovc]

@srirambv yes, I changed that so that you can see them easily

[srirambv]

++ manually tested and works fine.

[bsclifton]

Cherry-picked into 0.22.x and verified all test plans 😄

Really nice set of fixes here- print worked great, it's nice not having a new tab open for the key (not to mention, not storing the backup in the profile dir). Great job 😻

[bsclifton]

master 7c2cf6d
0.23.x e8fc619
0.22.x b39d39e