Changes the log level for variable expansion messages

[sajeerzeji]

Fixes #549

Changes the log level for variable expansion messages in ServerConfigDocument.resolveExpansionProperties() from INFO to DEBUG.

This eliminates unnecessary build log noise during normal variable expansion while preserving the diagnostic output when running Maven/Gradle in debug mode. This behavior is now consistent with VariableUtility.java.

Before (INFO level - noisy output in normal builds):

[INFO] Resolved environment variable "EXP_VAR" in path "{EXP_VAR}_{EXP_VAR2}" to "TEST"
[INFO] Resolved environment variable "EXP_VAR2" in path "{EXP_VAR}_{EXP_VAR2}" to "UNIX"
[INFO] Resolved path "{EXP_VAR}_{EXP_VAR2}" to "TEST_UNIX"

After (DEBUG level - clean normal builds):

Default build output:
(No expansion variable log noise printed)
When running in debug mode (-X in Maven / --debug in Gradle):

DEBUG] Resolved environment variable "EXP_VAR" in path "{EXP_VAR}_{EXP_VAR2}" to "TEST"
[DEBUG] Resolved environment variable "EXP_VAR2" in path "{EXP_VAR}_{EXP_VAR2}" to "UNIX"
[DEBUG] Resolved path "{EXP_VAR}_{EXP_VAR2}" to "TEST_UNIX"

[venmanyarun]

create a sync PR for this in main branch