Fix data submission to performance monitoring API.

[vbabanin]

JAVA-5994 (more description is in the ticket)

Success case:

Verified in: Evergreen patch

Failure case:

The task now fails with "System Failure" when encounters not 200 status from Cedar:

[2025/10/16 10:08:06.114] Running command 'shell.exec' in function 'send-dashboard-data' (step 3 of 3).
[2025/10/16 10:08:06.187] Error: Received HTTP status 422
[2025/10/16 10:08:06.187] Response Body: {redacted}
[2025/10/16 10:08:06.187] Command 'shell.exec' in function 'send-dashboard-data' (step 3 of 3) failed: shell script encountered problem: exit code 1.

Verified in: Evergreen patch

[stIncMale]

The linked "verified in" task has the System Failed status.

[stIncMale]

Please ignore #1828 (review). I did not realize that was for a failed case.