huanghg1994

[improve](shcema change)fix alter table faild when modify multiple columns with column changed positions

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## Proposed changes Issue Number: close #xxx when try to modify multiple columns with changed positions, attempting to modify a column that has already been moved will result in a...

[branch-2.1](resource)fix check available fail when s3 aws_token is set and reset as, sk faild on be.

6

## Proposed changes Issue Number: close #xxx ref #34057, fix same issue on branch 2.1 1. fe return 'S3 can't use, return "please check your properties" when AWS_TOKEN is set...

[Bug] [branch-2.1] When enable_nereids_dml is set to true, the value of a varchar column is truncated if the length of the column's value is greater than the schema length for that column

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### Search before asking - [X] I had searched in the [issues](https://github.com/apache/doris/issues?q=is%3Aissue) and found no similar issues. ### Version 2.1.2 ### What's Wrong? When enable_nereids_dml is set to true, the...