Only claim not redeemed tokens

[NejcZdovc]

Resolves brave/brave-browser#9891

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
  • Android
  • iOS
  • Linux
  • macOS
  • Windows
• Verified that these changes pass automated tests (unit, browser, security tests) on
  • iOS
  • Linux
  • macOS
  • Windows
• Verified that all lint errors/warnings are resolved (npm run lint)
• 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
• Public documentation has been updated as necessary. For instance:
  • https://github.com/brave/brave-browser/wiki/Deviations-from-Chromium-(features-we-disable-or-remove)
  • https://github.com/brave/brave-browser/wiki/Proxy-redirected-URLs
  • https://github.com/brave/brave-browser/wiki/Fingerprinting-Protections
  • https://github.com/brave/brave-browser/wiki/Brave%E2%80%99s-Use-of-Referral-Codes
  • https://github.com/brave/brave-browser/wiki/Custom-Headers
  • https://github.com/brave/brave-browser/wiki/Web-compatibility-issues-with-tracking-protection
  • https://github.com/brave/brave-browser/wiki/QA-Guide

Test Plan:

• enable rewards
• claim promotion
• go to publisher_info_db and in unblinded_tokens table mark some tokens as redeemed. (you do this with setting timestamp in redeemed_at column)
• connect KYC wallet
• wait for tokens to be transferred
• make sure that only non redeemed tokens were transferred (you can confirm this by looking at the payload and count t's)

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

After-merge Checklist:

• The associated issue milestone is set to the smallest version that the
  changes has landed on.
• All relevant documentation has been updated.

[NejcZdovc]

this is an actual change as we should only return tokens that has redeemed_at equal 0

[emerick]

LGTM

[NejcZdovc]

CI failed on macos, restating

[LaurenWags]

Verified passed with

Brave | 1.11.28 Chromium: 81.0.4044.138 (Official Build) nightly (64-bit)
-- | --
Revision | 8c6c7ba89cc9453625af54f11fd83179e23450fa-refs/branch-heads/4044@{#999}
OS | macOS Version 10.14.6 (Build 18G3020)

1. Launched with /Applications/Brave\ Browser\ Nightly.app/Contents/MacOS/Brave\ Browser\ Nightly --enable-logging=stderr --vmodule=*/bat-native-ledger/*=6,*/brave_rewards/*=6 --log-level=2 --rewards=staging=true --brave-ads-staging (note, changes to logging introduced with 1.11.x, not needed for testing with 1.10.x)
2. Enable rewards
3. Claim ad grant (restore a wallet with one waiting if necessary)
4. Close Browser
5. Go to publisher_info_db and in unblinded_tokens table mark some tokens as redeemed. To do this, I copied the timestamp from created_at to the redeemed_at column and set it 1 minute ahead.

6. Save changes. 7. Launch again with logging and connect KYC wallet. 8. Wait for tokens to be transferred 9. Make sure that only non redeemed tokens were transferred (you can confirm this by looking at the payload and count `t`'s) like in below snippet:

[ REQUEST ]
> URL: https://grant.rewards.bravesoftware.com/v1/suggestions/claim
> Method: UrlMethod::POST
> Content: 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> Content Type: application/json; charset=utf-8
> Header digest: SHA-256=tgX3PWinm7oHKu5y2WWTlc8e97dREvv2KyejsKzLh3k=
> Header signature: keyId="e521ed4e-294a-4c16-ad5f-803e8f45a514",algorithm="ed25519",headers="digest (request-target)",signature="09f81sVc0DNw2TcTIdVlo8C8uThUtyIgKtyiY53+ODo0HAsT5Kz5PUsyU8rJGQjhY0diK4UOcH9vsrydI6XADA=="
> Header accept: application/json
[18687:775:0527/075957.832595:VERBOSE6:credentials_promotion.cc(533)] 

In my example, I had 80 unblinded tokens in the DB. I marked 4 as redeemed. I should have 76 t's in the above log (Content section) and I do. Also confirmed the expected balance (19 BAT) shows in my Uphold wallet:

Encountered and logged brave/brave-browser#9967 while testing