[FR]: Can millisecond data be added to the timestamp information in the output XML file?

### Does the feature exist in the most recent commit?

Currently, the timestamp is only precise to the second level. Can millisecond data be added?

### Why do we need this feature?

The test case runs too quickly, and the time precision at the second level is insufficient, making it difficult to find the corresponding log of the tested application using this time.

### Describe the proposal.

change to
2025-06-25T20:54:29.123

%Y-%m-%dT%H:%M:%S.%f

### Is the feature specific to an operating system, compiler, or build system version?

no

Start by locating the code that generates timestamp information in the output XML and any existing tests for that output. Update the timestamp precision to include milliseconds in the requested format, then verify that the generated XML contains values such as 2025-06-25T20:54:29.123.

Written by the indexing model from the issue text.