HDDS-15311. [DiskBalancer] Fix DiskBalancer DN container Log Format

[Gargi-jais11]

What changes were proposed in this pull request?

DN container log file format as key worded columns is different in case of DiskBalancer compared to existing log lines. This may cause issue in any dn container formatter or parser in future.

2026-05-15 04:24:11,501 | INFO  | ID=11 | Index=0 | BCSID=1374 | State=CLOSED | Volume=/hadoop-ozone/datanode/data/hdds | DataChecksum=47c5ddd3 |
2026-05-15 05:02:20,188 | INFO  | ID=11 | SrcVolume=/hadoop-ozone/datanode/data/hdds | DestVolume=/data0/nvme1n1/hadoop-ozone/datanode/data/hdds | Size=268435456 bytes | TimeTaken=490 ms | Container is moved from SrcVolume to DestVolume |
2026-05-15 07:12:08,285 | INFO  | ID=11 | Index=0 | BCSID=1374 | State=CLOSED | Volume=/data0/nvme1n1/hadoop-ozone/datanode/data/hdds | DataChecksum=47c5ddd3 | Container reconciled with peer a49d6e1b-ee75-46c5-84eb-3ebde58b686f(datanode1.com/xx.xx.xx.xx). No change in checksum. | 

DiskBalancer should maintain the same structure.

What is the link to the Apache JIRA

https://issues.apache.org/jira/browse/HDDS-15311

How was this patch tested?

Tested manually.
Before:

2026-05-15 05:02:20,188 | INFO  | ID=11 | SrcVolume=/hadoop-ozone/datanode/data/hdds | DestVolume=/data0/nvme1n1/hadoop-ozone/datanode/data/hdds | Size=268435456 bytes | TimeTaken=490 ms | Container is moved from SrcVolume to DestVolume |

After:

2026-05-19 04:51:12,068 | INFO  | ID=13 | Index=0 | BCSID=16965 | State=CLOSED | Volume=/data/hdds1/hdds | DataChecksum=2cc81c5e |
2026-05-19 04:51:12,069 | INFO  | ID=14 | Index=0 | BCSID=16973 | State=CLOSED | Volume=/data/hdds1/hdds | DataChecksum=595237d2 |
2026-05-19 04:54:17,660 | INFO  | ID=13 | Index=0 | BCSID=16965 | State=CLOSED | SrcVolume=/data/hdds1/hdds | DestVolume=/data/hdds2/hdds | Size=967835648 bytes | TimeTaken=1777 ms | Container is moved from SrcVolume to DestVolume |
2026-05-19 04:55:17,405 | INFO  | ID=14 | Index=0 | BCSID=16973 | State=CLOSED | SrcVolume=/data/hdds1/hdds | DestVolume=/data/hdds2/hdds | Size=967835648 bytes | TimeTaken=1520 ms | Container is moved from SrcVolume to DestVolume |

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