fix:Compare computatation token versions in Millbase during exception handling.

[renjiezh]

The computation token could be updated by Herald of ControlService. The error handling should skip for outdated computation token.
fix #1918

[wfa-reviewable]

This change is 

[SanjayVas]

Reviewable status: 0 of 1 files reviewed, 1 unresolved discussion (waiting on @renjiezh)

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src/main/kotlin/org/wfanet/measurement/duchy/mill/MillBase.kt line 278 at r1 (raw file):

    if (latestToken.version != token.version) {
      logger.log(Level.WARNING, e) {
        "$globalId@$millId: Skip exception handling as token has been outdated."

I don't think we want to skip all exception handling. For example, handling StatusException. I think the main thing we want to avoid is trying to mutate or enqueue the computation.

You can probably solve this by just checking for StatusException first.