Adds retries into contribution flow for rewards

[NejcZdovc]

Resolves brave/brave-browser#1483
Resolves brave/brave-browser#1481

Native implementation: brave-intl/bat-native-ledger#175

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).
• Verified that these changes build without errors on
  • Windows
  • macOS
  • Linux
• Verified that these changes pass automated tests (npm test brave_unit_tests && npm test brave_browser_tests) on
  • Windows
  • macOS
  • Linux
• Ran git rebase master (if needed).
• 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.
• Add appropriate QA labels (QA/Yes or QA/No) to include the closed issue in milestone

Test Plan:

For easier debugging you can uncomment this sections https://github.com/brave-intl/bat-native-ledger/pull/175/files#diff-e91798fe1b25491970c7c977e168c25cR91

• try doing a contribution where you disconnect internet in between
• make sure that contribution finishes when you connect internet again (if nothing happens try restarting browser as this will retry it as well)

Reviewer Checklist:

• New files have MPL-2.0 license header.
• Request a security/privacy review as needed.
• Adequate test coverage exists to prevent regressions
• Verify test plan is specified in PR before merging to source

Notes

Will be also adding flags for QA as wel brave/brave-browser#2102

[NejcZdovc]

master (0.59) 6a69932
0.58.x dc2e088
0.57.x 0743544

[srirambv]

Uplift to 0.57.x approved by @rebron and @kjozwiak . Verified the PR works great 🥇