release-24.3.0-rc: tablemetadatacache,ui: change error messaging for failed tmj update

[kyle-a-wong]

Backport 1/1 commits from #134902.

/cc @cockroachdb/release

---

Previously, error messages from the table metaddata update job were surfaced in the UI on the table overview page. These errors are usually overly verbose and don't provide any actionable info to the end user.

In addition to this, error messages can be very big if the error is a result of a span stats fanout failure, which can contain errors for each fanned out request.

Now, db-console will simply report that an error occured in the job and that the data is stale. The error returned from failed SpanStats requests will now have a generic "An error has occurred while fetching span stats."

Epic: None
Release note: None

Old error messaging:

New error messaging:

[blathers-crl]

Thanks for opening a backport.

Please check the backport criteria before merging:

• Backports should only be created for serious
  issues or test-only changes.
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• There is a high priority need for the functionality that cannot wait until the next release and is difficult to address in another way.
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Also, please add a brief release justification to the body of your PR to justify this
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[cockroach-teamcity]

This change is 

[kyle-a-wong]

Closing PR. This as been backported to release-24.3 and this can wait until 24.3.1