Remove checks for unused keys in Transaction deserialization (uplift to 0.73.x)

[brave-builds]

Uplift of #3917

Approved, please ensure that before merging:

• You have checked CI and the builds, lint, and tests all pass or are not related to your PR.
• You have tested your change on Nightly.
• The PR milestones match the branch they are landing to.

After you merge:

• The associated issue milestone is set to the smallest version that the changes is landed on.

[kjozwiak]

Restarting iOS due to the following failure as per https://ci.brave.com/job/brave-browser-build-pr/job/pr3917_issue-6745-transactions-reset-after-restart_0.73.x/1/execution/node/543/log/:

18:57:01  1>WARNING: subprocess '"git" "fetch" "origin" "+refs/branch-heads/*:refs/branch-heads/*"' in /Users/jenkins/cache/chromium.googlesource.com-chromium-src failed; will retry after a short nap...
18:57:01  script returned exit code 143

Restarting macOS due to the following failure as per https://ci.brave.com/job/brave-browser-build-pr/job/pr3917_issue-6745-transactions-reset-after-restart_0.73.x/1/execution/node/582/log/:

18:55:16  Syncing Gclient (with reset)
18:55:16  /Users/jenkins/jenkins/workspace/tions-reset-after-restart_0.73.x: gclient sync --force --nohooks --with_branch_heads --with_tags --upstream
18:55:30  WARNING: Your metrics.cfg file was invalid or nonexistent. A new one will be created.
18:56:40  [0:01:00] Still working on:
18:56:40  [0:01:00]   src
18:56:40  [0:01:10] Still working on:
18:56:40  [0:01:10]   src
18:56:49  [0:01:20] Still working on:
18:56:49  [0:01:20]   src
18:57:00  Sending interrupt signal to process
18:57:01  [0:01:30] Still working on:
18:57:01  [0:01:30]   src
18:57:01  script returned exit code 143

[kjozwiak]

Uplift into 0.73.x approved after deliberating with @brave/uplift-approvers. This fix was also uplifted into 0.71.x as per #3937 so we'll need it in the other channels. Both CI/Jenkins and CI/Travis passed after restarting macOS several times.