Add last used column for API tokens

[nwmac]

Summary

Fixes #11870

Occurred changes and/or fixed issues

The PR adds the 'Last Used' information for API tokens, as implemented by this backend PR: rancher/rancher#45732

Technical notes summary

Fairly simple - we define a new column and add it to the API Keys/Tokens table. Added translation as well.

Note: This PR has been updated following review to show Unknown for the case that information is not available, since we can not determine been a token that has not been used and one that was created before this feature was updated, which may have been used.

Areas or cases that should be tested

• Go to the API Keys from the user preference menu (top right avatar)
• Verify that the tokens table included a 'Last Used' column
• Check the column sorting works correctly
• Hover over one of the Last Used cells and check that a tooltip appears, showing the absolute date/time

Screenshot/Video

New 'Last Used' column:

Hover on last used shows absolute date/time:

Checklist

• The PR is linked to an issue and the linked issue has a Milestone, or no issue is needed
• The PR has a Milestone
• The PR template has been filled out
• The PR has been self reviewed
• The PR has a reviewer assigned
• The PR has automated tests or clear instructions for manual tests and the linked issue has appropriate QA labels, or tests are not needed
• The PR has reviewed with UX and tested in light and dark mode, or there are no UX changes

[richard-cox]

Added question in comment. I couldn't see this working either using latest head

[nwmac]

@richard-cox Backend is not merge - I tested with a locally built Rancher from the backend PR.