Get latest page always from wayback machine

[simonhong]

By deleting timestamp value from wayback query, we can get latest saved page.
fix brave/brave-browser#14843

Submitter Checklist:

• I confirm that no security/privacy review is needed, or that I have requested one
• There is a ticket for my issue
• Used Github auto-closing keywords in the PR description above
• Wrote a good PR/commit description
• Added appropriate labels (QA/Yes or QA/No; release-notes/include or release-notes/exclude; OS/...) to the associated issue
• Checked the PR locally: npm run test -- brave_browser_tests, npm run test -- brave_unit_tests, npm run lint, npm run gn_check, npm run tslint
• Ran git rebase master (if needed)

Reviewer Checklist:

• A security review is not needed, or a link to one is included in the PR description
• New files have MPL-2.0 license header
• Adequate test coverage exists to prevent regressions
• Major classes, functions and non-trivial code blocks are well-commented
• Changes in component dependencies are properly reflected in gn
• Code follows the style guide
• Test plan is specified in PR before merging

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, 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-Exceptions-in-Brave
  • https://github.com/brave/brave-browser/wiki/QA-Guide
  • https://github.com/brave/brave-browser/wiki/P3A

Test Plan:

npm run test brave_unit_tests -- --filter=BraveWaybackMachineUtilsTest*

1. Load https://en.wikipedia.org/wiki/1960%E2%80%9361_UE_Lleida_season?&timestamp=20160101
2. Press Check for saved version
3. Check https://web.archive.org/web/20210315191803/https://en.wikipedia.org/wiki/1960%E2%80%9361_UE_Lleida_season is loaded
   W/o this PR, https://web.archive.org/web/20161220105407/https://en.wikipedia.org/wiki/1960%E2%80%9361_UE_Lleida_season is loaded due to timestamp value

[simonhong]

@diracdeltas I checked that encoding the whole url or query only both doesn't work.
wayback machine can't find saved version with encoded url.
I think invalidating timestamp is the only way to get latest saved page always.

For example, when query string in https://en.wikipedia.org/wiki/1960–61_UE_Lleida_season?&timestamp=20160101 is encoded,
query url is https://brave-api.archive.org/wayback/available?url=https://en.wikipedia.org/wiki/1960%E2%80%9361_UE_Lleida_season?%26timestamp%3D20160101.
and response for this query is below.
{"url": "https://en.wikipedia.org/wiki/1960\u201361_UE_Lleida_season?&timestamp=20160101", "archived_snapshots": {}}
If timestamp query is interpreted properly, url should be https://en.wikipedia.org/wiki/1960\u201361_UE_Lleida_season?.

[diracdeltas]

approach lgtm

[simonhong]

Merged because failure from dist step on Window is installer signing failure in CI.
and audit failure fro post-int. All both are not related with this PR.