fix(controller): Correct error formatting in trial controller package

[ruskaruma]

What this PR does / why we need it:
Fixes three error formatting issues in pkg/controller.v1beta1/trial/:

1. trial_controller_util.go:229 uses %e (scientific notation for floats) instead of %w, producing garbled output like &{%!e(string=...)} on timestamp parse errors.
2. trial_controller.go:61-63 uses fmt.Errorf() for sentinel errors that are compared with errors.Is(). Changed to errors.New() for immutability.
3. trial/util/job_util.go:82,103 uses %v instead of %w, which breaks the error chain for errors.Is()/errors.As() callers.

Which issue(s) this PR fixes:
Fixes #2628

Checklist:

• Docs included if any changes are user facing
  • N/A: internal error handling only, no user facing changes

[google-oss-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please assign gaocegege for approval. For more information see the Kubernetes Code Review Process.

The full list of commands accepted by this bot can be found here.

Details

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[ruskaruma]

@andreyvelich, can you please review this?